JPH03240044A - Photographic unit - Google Patents

Abstract

PURPOSE:To obtain a high sensitivity and the excellent image quality similar to the image quality obtd. under daylight in spite of photographing under various light sources of different color temps. by specifying the graininess of the min. density with blue/green light of a color negative photographic sensitive material having >=300 ISO sensitivity to a specific value or below and the response to a specific value or above. CONSTITUTION:The graininess (RMS) values of the min. density of the color negative photographic sensitive material having the red/green/blue photosensitive layers on a base and >=300 ISO photosensitive are specified to <=11 with blue light and <=10 with green light and the response at 20 pieces/mm space frequency is specified to <=70% with blue light and green light. The photographic unit having the high sensitivity and the excellent image quality of the good graininess similar to the graininess obtd. under the daylight in spite of photographing under the various light sources of the different color temps. are obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color negative photographic light-sensitive material photographing unit that combines a camera function of forming a photoimage and a light-sensitive material function of receiving and recording an image. In particular, the present invention relates to a photographing unit using a color negative photographic light-sensitive material with high sensitivity and high image quality, and more specifically, to a silver 10-genide color negative photographic light-sensitive material photographing unit that exhibits extremely little deterioration in image quality even when photographing with different light sources.

[Background of the invention]

In our daily lives, we sometimes come across scenes or materials that we need to photograph and record, but the camera we use to photograph them is not necessarily carried or prepared.
I sometimes miss photo opportunities. Moreover, such missed opportunities are surprisingly common, and there is a potentially profound need for a photographic system that can easily and quickly respond to each photographic opportunity.

To meet this demand, we have already mobilized silver halide photosensitive material technology and resin lens and resin precision molding technology to meet this demand.Although the precise photographic finish will be handed over to the conventional photographic system, we will be able to avoid missing photographic opportunities. It is now possible to construct a photographing system that can achieve the minimum necessary photographic purpose without any problems.

In other words, there are already commercially available photographic units that can be called "camera films" that have both camera and film functions, imitating the functions of the eye, which consists of the eyelids, the crystalline lens and vitreous body wrapped in an electrical membrane, and the retina. It is commonly known as a disposable camera.

The above-mentioned photographing unit (camera film) is aimed at low cost, so there are many unsatisfactory points in the photographic finish, and there has been a growing demand for improvement.

[Problems to be solved]

Photography units, which can be called "camera film" that have both camera and film functions, are being used for photographing more and more frequently because they can be used easily and quickly whenever a photographing opportunity arises.

Since these camera films are used not only for photographing subjects outdoors during the day, but also for photographing indoors, high-sensitivity color photographic materials with an ISO sensitivity of 300 or higher have traditionally been used as film functions.

When photographing indoors, artificial light sources such as electronic flashes (so-called strobes), incandescent tungsten light bulbs, fluorescent lights, and mercury lamps are commonly used. When photographing indoors, such as wedding halls, stages, shop windows, and indoor stadiums, strobes often cannot be used, and photographs must be taken under various artificial light sources such as incandescent tungsten bulbs, fluorescent lights, and mercury lamps.

In general, color negative photographic materials have a wider latitude than color reversal photographic materials, so
It has the excellent feature that there is no need to correct sensitivity due to differences in light sources, and color reproduction can also be corrected during printing.

However, the finished quality of color prints taken using color negative photographic light-sensitive materials under a light source with a color temperature different from that of daylight color, and color correction applied at the time of printing, is lower than that of color prints taken under daylight color light sources. (
graininess and sharpness) are often inferior.

Therefore, in high-sensitivity color negative photographic materials, it is desired that image quality (graininess and sharpness) equivalent to that under a daylight color light source can be obtained even when photographed under various light sources with different color temperatures.

In particular, it is easy to see that improving the quality of the loaded photosensitive material is most effective in improving the image quality, especially for general cameras that can have advanced exposure control and correction functions in a photographic unit. It is estimated that

For example, in JP-A No. 62-91945, there are three specific photosensitive layers: a low-speed emulsion layer, a medium-opening emulsion layer, and a high-speed emulsion layer.
A technique has been disclosed in which graininess is improved in an underexposed photographic region by setting the maximum color density of a high-sensitivity emulsion layer to 0.3 or less.

Although it is true that this method improves the graininess around the minimum density +0.2 and improves the image quality in underexposed shooting areas, the image quality in shooting areas under various light sources with different color temperatures is lower than that under daylight color light sources. It was considerably inferior to that of .

It is also known that graininess can be improved by increasing the amount of silver halide grains used in conventional films; Graininess is often impaired, and it is difficult to say that this is a technology that can be positively adopted from the viewpoint of deterioration of image quality such as sharpness and production cost.

Furthermore, conventionally known means for improving graininess include:
There are methods to reduce the grain size of silver halide and to increase the silver iodide content of silver halide, but although these methods can improve graininess, they result in a significant decrease in sensitivity. This method was not effective as a means for improving the graininess of high-sensitivity color photographic materials.

Further, there is a method of improving graininess and sharpness by using a large amount of a DIR compound, but this method involves undesirable side effects such as a decrease in sensitivity and a decrease in density.

As described above, even when using a photographing unit loaded with a silver halide photographic light-sensitive material prepared using the conventional technology, when photographing under various light sources with different color temperatures other than daylight color light sources,
It was difficult to obtain the same excellent image quality (graininess and sharpness) as under daylight.

[Purpose of the invention]

The purpose of the present invention is to improve graininess and sharpness so that even when photographing under various light sources with different color temperatures other than daylight color light sources, excellent image quality (graininess and sharpness) equivalent to photographing under daylight can be obtained. An object of the present invention is to provide a photographing unit with improved sharpness.

[Means for solving problems]

As a result of extensive research aimed at the above-mentioned purpose, the present inventors have found that when the minimum density granularity and sharpness of the light-sensitive material reach a specific balance, it is possible to We have found that image quality improves dramatically when taking pictures under light sources.

That is, the object of the present invention is to have at least one red-sensitive photosensitive layer, a green-sensitive photosensitive layer, and a blue-sensitive photosensitive layer each having a separate layer structure on a support, and have an ISO sensitivity of 300.
In the above silver halide color negative photographic material,
The minimum density granularity (RMS) is 11 or less for blue light and 10 or less for green light, and the sharpness (response) at a spatial frequency of 20 lines/mm is 70% for blue light and green light.
This is achieved by a photographing unit loaded with a silver halide color negative photographic light-sensitive material characterized by the above characteristics.

The light-sensitive material used in the silver halide color negative photographic light-sensitive material imaging unit of the present invention has an ISO sensitivity of 300 or more, but the ISO sensitivity of the light-sensitive material as referred to in the present invention shall be determined according to the test method shown below. . (J I
(according to SK 7614-1981) (1)
Test Conditions The test is carried out indoors at a temperature of 20°C, 5°C, and a relative humidity of 60±1O%, and the photosensitive material to be tested is left in this state for at least one hour before use.

(2) Exposure ■ The relative spectral energy distribution of the reference light on the exposure surface is as shown in Table 1.

Table 1 Fluctuation in light transmission density is 40 in the wavelength range of 360 to 700 nm
The area of less than 0 nm is within 10%, and the area of 400 nm or more is within 5%.

■ Exposure time is 1/100 seconds.

(3) Development Process ■ From exposure to development process, the photosensitive material to be tested is maintained at a temperature of 20±5° C. and a relative humidity of 60±1O%.

■Development processing should be completed within 30 minutes or more and within 6 hours after exposure.

■ Development processing shall be performed as follows.

The process was continued until three times the capacity of the stabilization tank was filled with replenisher.

Note: This is a value determined by standardizing the value of 560 nm to 100.

■ Changes in illuminance on the exposed surface are performed using an optical wedge, and the optical wedge used can be used for any part (the amount of replenishment is the value per 1m of photosensitive material). However, the stabilization process is
The experiment was carried out using a tank counter current, and the final tank of stabilizing liquid was replenished, and the overflow flowed into the previous tank.

Furthermore, part of the overflow of the stabilization tank following the fixing tank (2
75 m12/m”) was poured into the stabilization tank.

The composition of the color developing solution used is as follows.

Potassium carbonate 30g Sodium bicarbonate 2.7g Potassium sulfite 2.8g Sodium bromide 1.3g Hydroxylamine sulfate 3.2g Sodium chloride
0.6g 4-amino-3-methyl-N
-Ethyl-N-(β-hydroxylethyl)aniline sulfate 4.6g diethylenetriaminepentaacetic acid
3.0g potassium hydroxide
Add 1.3 g of water to make 1a, and add potassium hydroxide or 20
Adjust the pH to -10.01 using % sulfuric acid.

The composition of the color developer replenisher used is as follows.

Potassium carbonate 40g Sodium bicarbonate 3g Potassium sulfite 7g Sodium bromide
0.5g hydroxylamine sulfate 3.2g 4-amino-3-methyl-N
-Ethyl-N-(β-hydroxylethyl)aniline sulfate 6. Og diethylenetriaminepentaacetic acid 3,0
g Potassium hydroxide Add 2 g of water to make iff, and adjust the pH to -10, 12 using potassium hydroxide or 20% sulfuric acid.

The composition of the bleaching solution used is as follows.

1.3 Diaminopropanetetraacetic acid ferric ammonium 0.35 mol ethylenediamontera vinegar 62 Sodium 2g ammonium bromide 150g glacial acetic acid
40+++Q ammonium nitrate Add 40g of water and add 1(2
and adjust the pH to 4.5 using aqueous ammonia or glacial acetic acid.

The composition of the bleach replenishment solution used is as follows.

1.3. Ferric ammonium diaminopropanetetraacetate 0.40 mol Disodium ethylenediamontetraacetate 2g ammonium bromide 170g ammonium nitrate 50g glacial acetic acid
Add 61 mff of water to make IQ, adjust the pH to 3.5 using aqueous ammonia or glacial acetic acid, and adjust as appropriate to maintain the pH of the bleach tank solution.

The compositions of the fixer and fixer replenisher used are as follows.

Ammonium thiosulfate 100g Ammonium thiocyanate 150g Anhydrous sodium bisulfite 20g Sodium metabisulfite 4.0g Disodium ethylenediaminetetraacetate 1.0g Add water to make 700m (2) and adjust to pH = 6.5 using glacial acetic acid and aqueous ammonia. adjust.

The compositions of the stabilizing solution and stabilizing replenisher used are as follows.

1.2-Pentinthiazolin-3-one 0.1
g Hexamethylenetetramine 0.2g Hexahydro-1,3,5-triflu(2-hydroxyethyl)-5-triazine 0.3
The mixture was made up to 2 g water and adjusted to pH 7.0 using potassium hydroxide and 50% sulfuric acid.

(4) Concentration measurement Concentration is log. Expressed as (-8/-). -0 is the illumination light flux for density measurement, and - is the transmitted light flux of the part to be measured.

The geometric conditions for concentration measurement are that the illumination light flux is parallel light flux in the normal direction, and that the total light flux that is transmitted as a transmitted light flux and diffused in a half space is used.When using other measurement methods, the standard Perform correction using density pieces.

Also, during measurement, the emulsion film surface shall face the light receiving device side.

Concentration measurements are performed using Status M concentrations of blue, green, and red, and their spectral characteristics are summarized as the overall characteristics of the light source, optical system, optical filter, and light receiving device used in the densitometer (see Table 2 Status M).
Concentration spectral characteristics (logarithmic display, peak normalized to 5.00) Note *Red slope 0.260/nm, green slope 0.106
/nm, blue slope 0.250/nm **Red slope - 0,040/nm, green slope -
〇, 120/nm, blue slope - 0,220/nm (5) Determination of specific photographic sensitivity Using the results of processing and density measurement under the conditions shown in (1) to (4), follow the steps below. Determine specific photographic sensitivity.

■ 0.15 for each minimum density of blue, green, and red.
The exposure amount corresponding to a high density is expressed in lux seconds as Ha, Hc, )(il), respectively.

■ Let H be the larger value (lower sensitivity) of H,,H.

■ Calculate the specific photographic sensitivity S according to the formula below.

The RMS granularity referred to in the present invention is measured by the following method.

The sample used for measuring the RMS value is one that has been exposed and developed using the same method as the ISO sensitivity test method described above. The RMS value is the concentration of the measured part of the sample with an aperture scanning area of 1800 μm2 (10 μm in the slit, 18 μm in slit length)
Scanning is performed with a microdensitometer (0 μm), and the value is expressed as 1000 times the standard deviation of the fluctuation of the concentration value obtained by sampling 1000 or more samples.

RMS of each of the blue-sensitive photosensitive layer and the green-sensitive photosensitive layer
The granularity is measured using Eastman Kodak Co., Ltd. Utsuten filters W-47 and W-99, respectively, during the measurement.

Furthermore, the response at a spatial frequency of 20 lines/■, which indicates sharpness, is measured by the following method.

The sample used for the sharpness measurement is one that has been exposed using a wedge of rectangular waves (density difference 1.0) with varying frequencies and subjected to the development process described above.

The sharpness is determined by the aperture scanning area of 400μ of the concentration of the part to be measured of the sample.
Scanned with a microdensitometer of m'' (2μ rise in slit, slit length 200μm), and the spatial frequency was 0.3 lines/
Relative value of reproduced density difference at spatial frequency 20 lines/■ (%
).

The photosensitive material used in the photographing unit of the present invention has a 150 sensitivity determined by the method described above of 300 or more. If the sensitivity is less than 300, it is virtually impossible to take pictures using only an indoor light source such as an incandescent tungsten lamp, fluorescent lamp, or mercury lamp without using a strobe, and the object of the present invention cannot be achieved.

In the configuration of the present invention, the minimum density granularity (RMS) of the photosensitive material used in the photographing unit is 11 or less for blue light;
Less than 1O in green light and a spatial frequency of 20 lines/mm
The sharpness (response) is 7 in blue and green light.
It is necessary that R is 0% or more, and more preferably R
The MS granularity is 1O or less for blue light and 9 or less for green light, and the sharpness is 80% or more for blue light and green light.

It is preferable that the coating silver amount of the photosensitive material according to the present invention is smaller than that of conventional high-speed photosensitive materials.

Specifically, lo, 0g7m" or less, more preferably 9.
0 g/m” or less, more preferably 4.5 to 8.0 g/m
'is.

It is preferable that the amount of coated silver be small in that there is less increase in fog due to heat and natural radiation during storage of the high-sensitivity photosensitive material and less deterioration of graininess in the fogged area, that is, in the unexposed area.

The light-sensitive material according to the present invention has one or more red-sensitive silver halide emulsion layers, green-sensitive silver halide emulsion layers, and blue-sensitive silver halide emulsion layers in each color-sensitive layer,
In any case where the emulsion partial layers of the same color sensitivity are made up of two layers or three layers with different sensitivities,
Density share/coupler amount of silver halide emulsion layer, DIR
The object of the present invention can be achieved by designing the amount of compounds, the amount of silver halide, the silver halide grain size, and the film thickness in accordance with the structure of the present invention.

More specific means to achieve this include modifying the average normality composition of the silver halide grains used in high-sensitivity silver halide emulsion separation, the surface and internal normality compositions of the grains, and adjusting the monodispersity of the grains. , a means to improve graininess and sharpness while improving developability and preventing desensitization by optimizing the crystal phase and grain shape, or by slightly reducing the grain size, high-sensitivity silver halide emulsion components Means of mixing a plurality of silver halide emulsions with different grain sizes in a layer, and setting the coloring density of the high-sensitivity silver halide emulsion layer to 0.3 to 0.8, preferably 0.4 to 0.7. It is possible to improve sharpness by thinning the film, and to improve graininess and sharpness by optimizing the amounts of silver halide and DIR compounds used.

FIG. 1 shows an example of a configuration that can function as a photographing unit in the present invention.

This figure is a cross-sectional view taken along a plane defined by the lens optical axis and a straight line in the film movement direction that intersects with the lens optical axis.

In the figure, l is a lens, 2 is a shutter, 3 is a silver halide photosensitive material (referred to as a film), 4 is a photographing unit electric body, 5 is a light-shielding frame that covers the exposed area of the film, and 8
9 is a cartridge for storing the film, and 9 is a spool for winding the film.

6 is a cartridge holder, and 7 is a lens holder whose conical surface converging on the lens is treated to prevent stray light from entering.

In the specifications of the photographing unit mentioned above, the lens is f.
;8 to 6.3 spherical or aspheric fixed focus half-beam, constant aperture, and shutter speed of 1150 to 1/200 seconds.

As mentioned above, although it is a very simple camera with no exposure control mechanism, it is sometimes used at dusk or indoors when the amount of light is low, and high-sensitivity film is used. There is also a photography unit that comes with a strobe.

In addition to the risk of underexposure, there is also a strong risk of overexposure when photographing outdoors, resulting in images with poor gradation and insufficient color development. Particularly when a strobe is used, the detail and coloring of highlighted areas are completely lost.

The emulsion used in the film of the present invention has a coefficient of variation of 0.2
The following monodisperse AgX particles are preferred, and emulsions comprising core/shell type AgX are more preferred.

The core/shell type silver halide emulsion has a grain structure composed of two or more phases having different silver iodide contents.
It is preferable that the core (referred to as core) and the shell layer (referred to as shell), which are composed of silver halide grains, have the highest silver iodide content and are made of different silver iodobromide.

It is preferable to use a monodisperse silver halide emulsion in the silver halide color photographic light-sensitive material of the present invention.

A monodisperse silver halide emulsion is a monodisperse silver halide emulsion with an average grain size of ±
The weight of silver halide contained within the 20% grain size range is 70% or more of the total silver halide weight, preferably 80% or more, and more preferably 90% or more.

Here, the average particle size 1 is the frequency n1 of particles having particle size di
It is defined as the grain size di when the product ni Xdi' of and d13 is maximum. (3 significant figures, minimum 4 digits)
The particle size referred to here is the diameter when the projected image of the particle is converted into a circular image with the same area.

The particle size can be obtained, for example, by photographing the particles with an electron microscope at a magnification of 10,000 to 50,000 times, and actually measuring the particle diameter or projected area on the print. (The number of particles to be measured shall be at least 1000 indiscriminately.)
.

Particularly preferred highly monodisperse emulsions of the invention are
X 100 - Coefficient of variation (%) The coefficient of variation defined by the average particle size is 20% or less,
More preferably, it is 15% or less.

Here, the particle size measurement method shall follow the measurement method described above,
The average particle size is the arithmetic mean.

Σdini Average grain size = Σn1 The silver halide emulsion according to the present invention has an average silver iodide content of 4
It preferably consists of ~20 mol% silver iodobromide;
Particularly preferred is 5 to 15 mol%.

The silver halide emulsion of the present invention may contain silver chloride to the extent that the effects of the present invention are not impaired.

The silver halide emulsion of the present invention has a high silver iodide content phase inside the grains.

The silver iodide content of the high silver iodide content phase is 15 to 45 mol%
is preferable, more preferably 20 to 42 mol%, particularly preferably 25 to 40 mol%.

Internal core of high silver iodide content phase inside the grains of the present invention
The silver halide grains have a high silver iodide content phase with a shell of a low silver iodide content phase with a lower silver iodide content.
It is coated with

The average silver iodide content of the shell of the silver iodide content phase lower than the high silver iodide content phase of the core is preferably 6 mol % or less, particularly preferably 0 to 4 mol %. Further, the shell may have a multilayer structure, and an intermediate shell layer having a silver iodide content between the silver iodide content of the outermost shell layer and the high silver iodide content of the core may be interposed.

The silver iodide content of the intermediate shell layer is preferably 10 to 22 mol%, particularly preferably 12 to 20 mol%.

The difference in silver iodide content between the outermost shell layer and the middle shell layer, and between the middle shell layer and the core silver iodide content phase, is preferably 6 mol % or more, particularly preferably 10 mol % or more, respectively. There is a difference of more than mol%.

In the above embodiment, the central part of the high silver iodide content phase of the core,
Another silver halide phase may be present between the high silver iodide content phase of the core and the intermediate shell layer, or between the intermediate shell layer and the outermost shell layer.

In addition, the volume of the outermost shell layer is 4 to 70 mol% of the entire particle.
is more preferable, and 10 to 50 mol% is more preferable. The core volume of the high silver iodide content phase is preferably 10 to 80% of the total grain, more preferably 20 to 50%, and more preferably 20 to 45%. The volume of the intermediate shell layer is preferably 5 to 60%, more preferably 20 to 55%, of the entire particle.

These core and shell layers may each be a single phase with a uniform composition and may be a phase group whose composition changes stepwise, or may be a phase group whose composition changes continuously in the core and shell layers. It may be a continuous phase or a combination thereof.

The ultimate structure of the above embodiment of the silver halide emulsion of the present invention is that the silver iodide localized within the grains does not form substantially uniform phases in the core and shell layers, respectively; An example is an embodiment in which the content rate changes continuously from the center of the particle toward the outer part. In this case, it is preferable that the silver iodide content decreases monotonically from the point where the silver iodide content within the grain is maximum toward the outer side of the grain.

The silver iodide content at the point where the silver iodide content is maximum is
15 to 45 mol% is preferable, more preferably 25 to 4
It is 0 mol%.

Further, the silver iodide content of the grain surface phase is preferably 6 mol% or less, particularly preferably 0 to 4 mol% silver iodobromide.

The silver halide emulsion of the present invention preferably satisfies at least one of the following conditions (1) to (2).

■ Average silver iodide content determined by X-ray fluorescence analysis (
J,) and the silver iodide content (J2) on the grain surface determined by X-ray photoelectron spectroscopy, the relationship Jl>J2 is satisfied.

The particle size referred to here is the diameter of the circumscribed circle where the projected area of the particle is maximum.

X-ray photoelectron spectroscopy will be explained.

Prior to measurement by X-ray photoelectron spectroscopy, the emulsion is pretreated as follows. First, a pronase solution is added to the emulsion and stirred at 40°C for 1 hour to decompose gelatin. Next, the emulsion particles are sedimented by centrifugation, and after removing the supernatant, an aqueous pronase solution is added and gelatin decomposition is performed again under the above conditions. The sample is centrifuged again, the supernatant liquid is removed, and then distilled water is added to redisperse the emulsion particles in the distilled water, centrifuged, and the supernatant liquid is removed. After repeating this water washing operation three times, the emulsion particles are redispersed in ethanol. This is applied thinly onto a mirror-polished silicon wafer to use as a measurement sample.

For measurements by X-ray photoelectron spectroscopy, for example, P
Using ES CA/S AM560 model manufactured by H1 Co., Ltd., the test is carried out under the conditions of excitation X-rays, Mg- and alpha rays, X-ray source voltage of 15 KVS, X-ray source current of 40 mA, and bus energy of 50 eV.

Ag5d, Br5d to determine the surface halide composition
.

Detects 13d3/2 electrons. The composition ratio is calculated by the relative sensitivity coefficient method using the integrated intensity of each peak. Ag
By using 5.10.0.81.4.592 as the relative sensitivity coefficient for 5d, Br5d, I3d3/2, respectively, the composition ratio is given in atomic percent.

■ Silver halide grains that are 80% or more away from the center in the grain diameter direction of silver halide grains using the average silver iodide content (Jl) determined by the above-mentioned X-ray fluorescence analysis method and the X-ray microanalysis method. When the average value (J,) of the silver iodide content measured on the crystal is compared, the relationship Jl>Js is satisfied.

The X-ray microanalysis method will be explained.

Silver halide particles were dispersed in an electron microscope observation grid equipped with an energy dispersive X-ray analyzer in an electron microscope, the magnification was set so that one particle entered the CRT field of view with liquid nitrogen cooling, and AgLα was exposed for a certain period of time.

Integrate the intensity of the ILa line.

The silver iodide content can be calculated using the intensity ratio of +Lα/AgLσ and a previously prepared calibration curve.

■ In the X-ray diffraction method, CuKC rays were used as the radiation source (4
20) Maximum peak height of X-ray diffraction signal XO,1
3, it is necessary that the signal exists continuously over a diffraction angle of 1.5 degrees or more.

More preferably, the highest peak height of the signal x 0.15
In this case, a signal exists continuously over a diffraction angle of 1.5 degrees or more. Furthermore, it is preferable that the diffraction angle at which the signal exists extends over 1.8 degrees, especially 2
．． Preferably, the temperature is greater than or equal to 0 degrees.

The presence of a signal means that the signal intensity is greater than or equal to the highest peak height Xo, 13 or 0.15.

A further preferred embodiment of the silver halide emulsion of the present invention is Cu
The above (420) X-ray diffraction signal using the KC ray as a radiation source has two or three peaks. Particularly preferred is one having three peaks.

In the X-ray diffraction method, which is a method for investigating the structure of silver halide crystals, various characteristic X-rays can be used as the X-ray source. Among them, CuK that targets Cu
The C line is the most widely used.

Silver iodobromide has a rock salt structure, and the CuKC line (420)
Diffraction lines are observed at 2θ71 to 74 degrees. Since the signal intensity is relatively strong and the angle is high, the resolution is good, making it ideal for investigating crystal structures.

When measuring X-ray diffraction of a photographic emulsion, it is necessary to remove gelatin, mix with a standard sample such as silicon, and measure using a powder method.

Regarding the measurement method, refer to Basic Analytical Chemistry Course 24 "X-ray Analysis" (Imori Publishing).

(2) When the average silver iodide content of individual silver halide grains is measured by the aforementioned X-ray microanalysis method, the relative standard deviation of the measured values is 20% or less. Preferably 1
It is 5% or less, particularly preferably 12% or less.

The relative standard deviation here is, for example, the value obtained by dividing the standard deviation of the silver iodide content when measuring the silver iodide content of at least 100 emulsions by the average silver iodide content at that time x 10
It is 0.

The silver halide emulsion of the present invention is cubic, tetradecahedral, 18
It may be a normal crystal like a hedron or a twin crystal like a tabular shape.

Alternatively, a mixture of these may be used.

In the case of tabular twins, the ratio of the equivalent circular diameter to the grain thickness is 1 to 20, which accounts for 60% of the projected area.
It is preferably 1.2 or more and less than 8.0, particularly preferably 1.5 or more and less than 5.0.

Monodisperse normal crystal emulsions are disclosed, for example, in JP-A-59-1775.
No. 35, No. 60-138538, No. 59-52238
No. 60-143331, No. 60-35726,
It can be manufactured by referring to the methods disclosed in JP-A No. 60-258536 and JP-A No. 6114636.

Monodisperse twin emulsions are disclosed, for example, in JP-A-61-14636.
It can be obtained by referring to the method for growing a spherical seed emulsion disclosed in the above publication.

During growth, it is preferable to add a silver nitrate aqueous solution and a halide aqueous solution by a double jet method.

Further, the silver iodide can also be supplied into the system as silver iodide.

The addition rate is preferably such that new nuclei are not generated and the size distribution does not widen due to Ostwald ripening, that is, 30 to 100% of the rate at which new nuclei are generated.

As another condition for enlarging the particles, the Photographic Society of Japan
As shown on page 88 of the 88th Annual Conference Abstracts, there is a method of enlarging the material by adding fine silver halide particles, dissolving and recrystallizing.

The growth conditions for the silver halide emulsion include pAg5-11.
．． Preferably, the temperature is 40-85°O and the pH is 1.5-12.

In the present invention, the silver halide emulsion used is one that has been subjected to physical ripening, chemical ripening, and spectral sensitization.

Additives used in such processes are listed in Research Disclosure No. 17643. No. 18716 and No.

308119 (each hereinafter referred to as RD17643.RD
18716 and RD308+19).

The table below shows the locations.

[Item] (page of RD308119)
(RD17643) [RD18716]
Chemical sensitizer 996 I[+-A term
23 648 Spectral sensitizer 996 IV-
AA, B, C, D, H, H, I, J items 23-24
648-9 supersensitizer 996 1V-A-E,
Section J 23-24 648-9 Antifouling agent 998 Vl 24-2
5 649 Stabilizer 998 ■ Known photographic additives that can be used in the present invention are also described in the Research Disclosure above.

The relevant entries are shown in the table below.

[Item] (Page of RD308119) Color clouding prevention agent ・ 1002 Section ■-■ Dye image stabilizer 1001 Section ■-J Whitening agent
998V Ultraviolet absorber 1003 ■ Light absorber 1003 ■ Light scattering agent 1003 ■ Filter dye 1003 ■ Binder 1003 ff Static inhibitor 1006 11 [[Hardener 10
04 X Plasticizer 1006 XN Lubricant
1006 ff activator/coating aid 100
5 II matting agent 1007 1VI developer (contained in the sensitive material) roll Section IIB Various couplers can be used in the present invention, and specific examples thereof include:
As stated in the Research Disclosure above.

The relevant entries are shown in the table below.

(RD17643) CRD18716) 25 6
50 5 4 25-26 25-26 Xm0 term C9 [item] (page of RD308119)
[RD17643) [RDt8716)
Yellow coupler 1001 ■-ri term
■C-G term magenta coupler 1001 ■-D
Item ■C-G Item Anon Uncoupler 100
1 ■-RI term ■C-G term colored coupler 1002 ■-G term ■G term DIR coupler 1001 ■-F term
■ Section F BAR coupler 1002 ■- Section F Other useful residue-releasing couplers 1001 ■- Section F alkali-soluble coupler +001 ■- Section E Complete The additives used in the present invention include the dispersion method described in RD30811911V. It can be added by

In the present invention, the aforementioned RD1764328 page, RD1
The supports described on pages 8716647-8 and RD308+19, X■ can be used.

The photosensitive material of the present invention can be provided with auxiliary layers such as a filter layer and an intermediate layer described in the above-mentioned RD308119--.

The photosensitive material of the present invention can have various layer structures such as normal layer, reverse layer, and unit structure as described in the section RD308119--.

The present invention covers color negative films for general use or movies, color reversal films for slides or televisions,
It can be applied to various color photosensitive materials such as color paper, color positive film, and color reversal paper.

The photosensitive material of the present invention is the aforementioned Ro1764328-29,
Development processing can be carried out by the usual method described in page RD18716647 and RD308119, X■.

〔Example〕

Specific examples of the present invention will be described below, but the embodiments of the present invention are not limited thereto.

In all the examples below, the amount added in the silver halide photographic light-sensitive material is expressed in grams per m2 unless otherwise specified. Furthermore, silver halide and colloidal silver are shown in terms of silver. Further, the sensitizing dye is expressed in moles/mol of silver.

Example 1 A multilayer color photographic material comparative sample-1O1 was prepared by sequentially forming layers having the compositions shown below on a triacetyl cellulose film support from the support side.

Sample-101 1st layer; anti-haline layer (HC black colloidal silver UV absorber (UV-1) high boiling point solvent (Oi12-1) gelatin l) 0.2 0.23 0.18 1.4 2nd layer; First intermediate layer (IL-1) Gelatin 1.3 Third layer: Low sensitivity red-sensitive emulsion layer (RL) Silver iodobromide emulsion (average grain size 0.4 μm) Sensitizing dye (SD-1) Sensitizing dye (SD-2) Sensitizing dye (SD-3) Cyan coupler (C-1) Colored cyan coupler (CC-I) DIR compound (D-1) DIR compound (D-3) High boiling point solvent (OlQ-1) Gelatin 1.0 1.8 ) Silver iodobromide emulsion (average grain size 0.7 μm) Sensitizing dye (SD-1) Sensitizing dye (SD-2) Sensitizing dye (SD-3) Cyan coupler (C-1) Colored cyan coupler ( CC-I DIR compound (D-1) High boiling point solvent (Oi (2-1) Gelatin 5th layer; High sensitivity red-sensitive emulsion layer (RH) Silver iodobromide emulsion (average grain size 0.8 μm) Sensitizing dye (SD-1) Sensitizing dye (SD-2) Sensitizing dye (-SD-3) Cyan coupler (C-1) Cyan coupler (C-2) Colored cyan coupler (CC-I DIR compound (D-1) ) High boiling point solvent (OlQ-1) 0.8 2, lX 10-' 1.9X 10-' 1.9X 10-' 0.28 ) 0.027 0.0I O026 0,6 1,70 1,9X 10-' 1.7X 10-' 1.7X 10-' 0.05 0.10 ) 0.02 0.025 0.17 Gelatin 6th layer: 2nd intermediate layer (IL-2) Gelatin 7th layer: Low-speed green-sensitive emulsion layer (GL) Silver iodobromide emulsion (average grain size 0.4 μm) Sensitizing dye (SD-4) Sensitizing dye (SD-5) Magenta coupler (M-1) Magenta coupler (M- 2) Colored magenta coupler (CM DIR compound (D-2) DIR compound (D-3) High boiling point solvent (Oil2-2) Gelatin 8th layer, medium-sensitivity green-sensitive emulsion layer (GM) Silver iodobromide emulsion (average Particle size: 0.7 μm) Sensitizing dye (SD-6) Sensitizing dye (SD-7) Sensitizing dye (50-8) Magenta coupler (M-1) 1.2 0.8 1.10 6.8X 10 -' 6.2X 10 information 0.54 0.19 1) 0.06 0.017 0.0I O381 1,8 0,7 1,9X 10-' 1.2X 10-' 1.5X 10-' 0 .07 Magenta coupler (M-2) Colored magenta coupler (CM DIR compound (D-2) High boiling point solvent (Oi(2-2) Gelatin 9th layer; High sensitivity green-sensitive emulsion layer (GH) Silver iodobromide emulsion (Average particle size 1.2 μm) Sensitizing dye (SD-6) Sensitizing dye (SD-7) Sensitizing dye (SD-8) Magenta coupler (M-1) Magenta coupler (M-3) Colored magenta coupler ( CM High boiling point solvent (0:(1-2) Gelatin 1st O layer; Yellow filter layer (yc) Yellow colloidal silver stain inhibitor (S(, -1) High boiling point solvent (O44-2) Gelatin 0.03 1) 0.04 0.018 0.30 0.8 1.90 1.2X 10-" 1, OX 10-' 3.4X 10-' 0.12 0.06 1) 0.04 0.35 1.4 0.05 0.1 0.13 0.7 Formalin scavenger (H5-1) 0.09 Formalin scavenger (H5-2) 0.07 11th layer: Low-sensitivity blue-sensitive emulsion layer (BL) Iridescent odor Silver oxide emulsion (average grain size 0.4
μm) Silver iodobromide emulsion (average grain size 0.7 μm) Sensitizing dye (SD-9) Sensitizing dye (SD-10) Yellow coupler (Y-1)... Yellow coupler (Y-2) DIR compound (D-1) High boiling point solvent (O1 (22) Gelatin formalin scavenger (H5-1) 12th layer: High sensitivity blue-sensitive emulsion layer (BH) Silver iodobromide emulsion (
Average particle size: 1.2 μm) Sensitizing dye (SD-9) Sensitizing dye (SD-10) Yellow coupler (Y-1) Yellow coupler (Y-2) High boiling point solvent (○iQ 2) 0. 20 0.50 5.2X 10-' 1.9X 10-' 0.70 0.28 0.03 0.18 1.3) 0.08 1.0 1.8X 10-' 7.9X 10-' 0.20 0.08 0.085 Gelatin formalin scavenger (H3-1) Formalin scavenger (H3-2) 13th layer: 1st protective layer (Pro-1) Fine grain silver iodobromide emulsion (average grain size 0 .08μm Agl 1 mol%) Ultraviolet absorber (UV-1) Ultraviolet absorber (UV-2) High boiling point solvent (Oil-1) High boiling point solvent (Oi (2-3) Formalin scavenger (H3-1) tt (H32) Gelatin 14th layer; 2nd protective layer (Pro-2) Alkali-soluble matting agent (average particle size 2 μm) Polymethyl methacrylate (average particle size 3 μm) Sliding agent (WAX-1) Gelatin 1.40 0.05 0.12 0.4 0.07 0.10 0.07 0.07 0.13 0.37 1.3 0.13 0.02 0.04 0.6 CM ■ S u-1 C2H5 Weight average molecular weight Mw =3,000 u-2 D F In addition to the above composition, coating aid 5u-1, dispersion aid 5u
-2, viscosity modifier, hardener H-1, H-2, stabilizer S
T, -1, antifoggant AF-1゜MW: 10
,000 and M w : 1.100. ooo two types of AF2 were added.

Note that the average particle size is expressed as a particle size converted into a cube. Each emulsion was also optimally gold-sulfur sensitized.

Furthermore, in comparative sample 101, blue-sensitive photosensitive layers (BU-1 to BU-4) in place of the 11th layer and the 12th layer, and the 7th layer,
Green-sensitive photosensitive layers (GU-1 to GU-
4) was used to prepare samples (102 to 108
)It was created. Blue-sensitive photosensitive layer-1 (BU-1) 1st layer; Low-sensitivity blue-sensitive emulsion layer (BL) Silver iodobromide emulsion (average grain size 0.4 μm) 0.1511
(Average particle size Q, 7μm) 0.35 sensitizing dye (SD~9) 5.2x 10-'H
(S D -10) 1.9X 10-' Yellow coupler (Y -1) 0.65 Yellow coupler (Y -2) 0.24D
IR compound (D-1) 0.03 High boiling point solvent (Oi12-2) 0.18 Gelatin 1.30 Formalin scavenger (HS-1) 0.08 12th layer; High sensitivity blue-sensitive emulsion layer (B H) Silver iodobromide emulsion (average grain size 1.0 μm) 1.00 sensitizing dye (S D -
9) 1.8X 10-'// (S
D -to) 7.9X 10-' Yellow coupler (Y-1) 0.15 Yellow coupler (Y-2) 0.05 High boiling point solvent (O
i12-2) 0.074 gelatin
1.30 Formalin scavenger (HS-1”) 0.05 Formalin scavenger (HS-2) 0.12 Blue-sensitive photosensitive layer-2 (BU-
2) 11th layer: Low-speed blue-sensitive emulsion layer (BL) Silver iodobromide emulsion (average grain size 0.4 μm) 0.1511
(Average particle size 0.7 μm) 0.35 sensitizing dye (SD-9) 5.2X 10-'
tt (SD-10) 1.9x
10-' Yellow coupler (Y -1) 0.65 Yellow coupler (Y-2) 0.24 DIR compound (D -1) 0.03 High boiling point solvent
(OiQ-2) 0.18 gelatin
1.30 formalin scavenger (HS-T12 layer; high-sensitivity blue-sensitive emulsion layer (BH) silver iodobromide emulsion (average grain size 1.0 μm) sensitizing dye (SD-9) tt (SD 10) yellow coupler (Y-1) Yellow coupler (Y-2) High boiling point solvent (OlQ-2) Gelatin formalin scavenger (HS Formalin scavenger (HS Blue-sensitive photosensitive layer-3 (BU-3) 11th layer; low sensitivity blue sensitivity Emulsion layer (BL) Silver iodobromide emulsion (average grain size 0.4 μm) // (average grain size 0.7 μm) Sensitizing dye (SD-9) tt (SD 10) Yellow coupler (Y-1) Yellow Coupler (Y-2) DIR compound (D-1) l ) 0.08 ■, 20 1.8X 10-' 7.9X 10-' 0.13 0.04 0.085 1.50 1) 0.05 2) 0.12 0.15 0.35 5.2X 10-' 1.9X 10-5 0.65 0.24 0.03 High boiling point solvent (Oi(2-2) Gelatin formalin scavenger (HS-1 12th layer; High sensitivity blue-sensitive emulsion layer (B H) Silver iodobromide emulsion (average grain size 0.86 μm) Sensitizing dye (SD-9) // (SD-10) Yellow coupler (Y-1) Yellow Coupler (Y-2) High boiling point solvent (O4(2-2) Gelatin formalin scavenger (H Formalin scavenger (H) ) Silver iodobromide emulsion (average grain size 0.4 μm) (average grain size 0.4 μm)
7 μm) Sensitizing dye (SD-9) tt (SD 10) Yellow coupler (Y-1) 1.20 1.8X 10-' 7.9X 10-' 0.18 0.07 0.080 1.3O 5-1) 0.05 5-2) 0.12) 0.18 1.30 0.08 0.15 0.35 5.2x 10-' 1.9X to-' 0.65 Yellow coupler (Y- 2) DIR compound (D-1) High boiling point solvent (Oi12-2) Gelatin formalin scavenger (H3-1) 12th layer: High sensitivity blue-sensitive emulsion layer (B H) Silver iodobromide emulsion (average grain size 1 .0 μm) Sensitizing dye (SD-9) tt (SD 10) Yellow coupler (Y-1) Yellow coupler (Y-2) High boiling point solvent (oIa-2) Gelatin formalin scavenger (H5-1) Formalin Scavenger (H3-2) Green-sensitive photosensitive layer-I CGU-1) 7th layer: Low-sensitivity green-sensitive emulsion layer (GL) Silver iodobromide emulsion (average grain size 0.4 μm) Sensitizing dye (SD-4) ) Sensitizing dye (SD-4) 6.8X 10-' 1.00 1.8X 10-' 7.9X 10-' 0.15 0.05 0.060 1.10 0.05 0.12 6- 2X 10-' 0.24 0.03 0.18 1.30 0.08 1.10 Magenta coupler (M-1) Magenta coupler (M-2) Colored magenta coupler (CM-1) DIR compound (
D-2) DIR compound CD-3) High boiling point solvent (OiI2-2) Gelatin 8th layer; medium-sensitivity green-sensitive emulsion layer (GM) Silver iodobromide emulsion (average grain size 0.7 μm) Sensitizing dye (SD -6) Sensitizing dye (SD-7) Sensitizing dye (SD-8) Magenta coupler CM-1) Magenta coupler (M-2) Colored magenta coupler (CM-1) DIR compound (
D-2) High boiling point solvent (Oi (1-2) 0.70 1.9X 10-' 1.2X 10-' 1.5X 1O-1I O2O3 0,03 0,04 0,018 0,30 0, 80 Gelatin 9th layer; high-sensitivity green-sensitive emulsion layer (GH) Silver iodobromide emulsion (average grain size 1.0 μm) 0.54 0.19 0.06 -017 0.0I O081 1,80 1,70 Increase Sensitive dye CS D-6) 1.2X 10
-' Sensitizing dye (SD-7) 1. OX
10-'sensitizing dye (SD-8) 3.4
X to-' magenta coupler (M-1)
0.09 Magenta coupler (M-3) 0.04 Colored magenta coupler (CM -1> 0.04 High boiling point solvent (OiQ -2) 0.31 Gelatin 1.20 Green-sensitive photosensitive layer-2 (GU-2) 7th layer; low-sensitivity green-sensitive emulsion layer (GL) silver iodobromide emulsion (
Average particle size: 0.4 μm) 1, 10 sensitizing dye (S
D-4) 6.8x 10-' sensitizing dye (SD-4) 6.2x 10-bite magenta coupler (M-1) 0.54 magenta coupler (M-2) 0.19 colored magenta coupler (CM-1) 0.06DIR compound (
D-2) 0.017DIR compound (
D-3) 0.01 high boiling point solvent (○i
12-2) 0.81 gelatin'
1.8081!8 layers; medium-sensitivity green-sensitive emulsion layer (G
M) Silver iodobromide emulsion (average grain size 0.7 μm) 0.
70 sensitizing dye (SD-6) 1.9X 10-' sensitizing dye (SD-7) 1.2X 10-' sensitizing dye (S
D-8) 1.5X 10-' magenta coupler (M-1) 0.07 magenta coupler CM-2) 0.03 colored magenta coupler (c M-1) 0.04 DIR compound (
D-2) '0.018 high boiling point solvent (
Oi12-2) 0.30 gelatin
0.80 9th layer; High-sensitivity green-sensitive emulsion layer (GH) Silver iodobromide emulsion (average grain size 1.0 μm) 1.70
Sensitizing dye (SD-6) 1.2X to-' Sensitizing dye (SD-7) 1. OX 10-' Sensitizing dye (SD-8) 3.4XlO-' Magenta coupler (M-1) 0.09 Magenta coupler (M-3) 0.04 Colored magenta coupler (CM-1) 0.04 High boiling point Solvent (Oi
Q-2) 0.40 gelatin
1.40 Green-sensitive photosensitive layer-3 (GU
-3) 7th layer; low-sensitivity green-sensitive emulsion layer (GL) Silver iodobromide emulsion (average grain size 0.4 μm) 1.10
Sensitizing dye (SD-4) 6.8X 10
-' Sensitizing dye (SD-4) 6.2X
10-' Magenta coupler (M-1) 0.
54 magenta coupler (M-2) 0.19
Colored magenta coupler (CM-1) 0.06DI
R compound (D-2) 0.017DIR
Compound (D-3) 0.01 High boiling point solvent (Oi+2-2) 0-81 Gelatin 1.80 8th layer: Medium-sensitivity green-sensitive emulsion layer (GM) Silver iodobromide emulsion (average grain size 0.7 μm) 0.70
Sensitizing dye CS D-6) 1.9X 10-
'Sensitizing dye (SD-7) 1.2X 10
-' Sensitizing dye CS D -8) 1.5X
10-' Magenta coupler (M-1) 0.
07 Magenta coupler (M-2) 0.0
3-color magenta coupler (CM DIR compound (D-2) High boiling point solvent (Oi12-2) Gelatin 9th layer; High sensitivity green-sensitive emulsion layer (GH) Silver iodobromide emulsion (
Average particle size 1.0μm) Sensitizing dye (SD-6) Sensitizing dye (SD-7) Sensitizing dye (SD-8) Magenta coupler (M-1) Magenta coupler (M-3) Colored magenta coupler (CM High boiling point solvent (01Q-2) Gelatin green-sensitive photosensitive layer-4 (GU-43 7th layer: low-sensitivity green-sensitive emulsion layer (GL) Silver iodobromide emulsion (average grain size 0.4 μm) Sensitizing dye (SD -4) Sensitizing dye (SD-4) Magenta coupler (M-1) )0.04 0.018 0.35 1.00 1.70 1.2X 10-' 1, OX 10-' 3.4X 10 -@ 0.08 0.04 1 ) 0.04 0.30 1.20 1, +0 6.8X 10-6 6.2X 10-' 0.54 Magenta coupler (M-2) Colored magenta coupler (CM- I DIR compound (D-2) DIR compound (D-3) High boiling point solvent (○1122) Gelatin 8th layer; medium green-sensitive emulsion layer (GM) Silver iodobromide emulsion (average grain size 0.7 μm) Increased Sensitizing dye (SD-6) Sensitizing dye (SD-7) Sensitizing dye (SD-8) Magenta coupler (M-1) Magenta coupler (M-2) Colored magenta coupler (CM-I DIR compound (D- 2) High boiling point solvent (Oi12-2) Gelatin 9th layer; High sensitivity green-sensitive emulsion layer (GH) Silver iodobromide emulsion (average grain size 1.0 μm) Sensitizing dye (SD-6) 0.60 1. 9X 10-' 1.2X to-' 1.5X to-' 0, Io 0.05 ) 0.04 0.019 0.27 0.70 1.2X to-' 0.19 ) 0.06 0. 017 0.01 O681 1,80 1,50 Sensitizing dye (SD-7) 1. clXlO-'
Sensitizing dye (SD-8) 3.4X 10
-'Magenta coupler (M-1) 0.09
Magenta coupler (M-3) 0.04 Colored magenta coupler (CM-1) 0.04 High boiling point solvent (OIQ-2) 0.25 Gelatin 1.00 Table-1 Comparative samples 101 to 1 prepared as above The ISO sensitivity, minimum density granularity (RMS), and sharpness (response) at a spatial frequency of 20 lines/mva were measured for Samples 105 and 106 to 108 of the present invention. Each exposure, development, and measurement method followed the method shown above.

The results are shown in Table-2.

Table-2 I did it.

After that, the same process as the above IS○ sensitivity measurement method is performed,
Prints were printed on 2L size Konica color paper so as to have the same color tone and density as possible, and visual evaluation was performed. The image quality evaluation focused on graininess and sharpness, and was evaluated in three stages: O (good image quality), Δ (slightly poor image quality), and × (poor image quality).

The results are shown in Table-3.

Table 3 Example 2 Using samples 101-108, a photographing unit as shown in FIG. 1 was created.

Next, using each photography unit, comparative photography was carried out with a person as the subject outdoors in daylight and indoors where the light source was an incandescent tungsten bulb, fluorescent lamp, or mercury lamp.As can be seen from the results, the present invention Good image quality equivalent to daylight photography was obtained using different types of light sources, including incandescent tungsten bulbs, fluorescent lamps, and mercury lamps.

On the other hand, in Comparative Samples 101 to 105, it was confirmed that the image quality deteriorated significantly when photographing under daylight regardless of the different light sources. Also, when photographing under daylight, comparative sample 1
The difference in image quality between Samples 01-105 and Samples 106 to 108 of the present invention is small.

As described above, according to the present invention, an improved photographing unit can be provided so that excellent image quality equivalent to that under daylight can be obtained even when photographing under various different types of light sources other than the daylight color light source.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an example of the photographing unit of the present invention taken along a plane formed by the lens optical axis and the film moving direction. l...Lens 2...Shutter 3...Film 4...Unit leaf 5...Shading frame 6...Patrone holder 7...Stray light prevention cone 8...Patrone 9... ·spool

Claims (1)

[Claims] A silver halide color negative photographic material having at least one red-sensitive layer, a green-sensitive layer and a blue-sensitive layer each having a separate layer structure on a support, and having an ISO sensitivity of 300 or more, Minimum density granularity (RM
A silver halide color negative photographic light-sensitive material, characterized in that S) is 11 or less for blue light and 10 or less for green light, and the response at a spatial frequency of 20 lines/mm is 70% or more for blue light and green light. Photographic unit loaded with.