SU49830A1 - Light meter - Google Patents

Description

Existing exposure meters; exposure for iositig.Ibsx lipouecvii.x on bromo-silver i: chlorobromo-sulfur iumagl or very expensive n complex (.cheni-metersfillografrafy, sensoritometry), lyo. Pa Mriiepa), oo require oo.ihiiioro full time and materials l.h definition expo: h1ts 1I. Ish1x1x; moreover, for the oiredglein expo. A well-known gradational negative also takes a lot of straps for both the production of the negative itself and HI receiving stepped photograms from it.

The present invention aims to achieve onomotry a rather simple K (HcrpVKHiiH and ie, tr; -y; O1iiy for use ..; "n; iH ghgraty time. Once a negative exposure meter can be used for mass production of the actual meter by simple copying with a nepatypa pa photographic plate or film.

In FIG. 1 depicts the nnd exec 111 tra; : l. . - viewing: frame.

on myself 1: not; 1 j mri. o woven tightly; o; i (serum shilluch igorak-vertknpoy ct4) oii iiiiv.i.ibi Ave cefbix iiKa.ui iepny.h, h :. n.iOHOK skleni GLK) ts: 1;: vvT plom p. Exposure meter 1parazh: 11 tjii. 1. For marketing;: 5H scale; ,: Foot. Lei ltrespk;:;; l i:.: a, 4r; i) aevc «:: od .1 crojii.a K.icety POST1; LO 5 KG; GOTS, od pgao-: si but the number

smedopagelyk) about gradaimy; opirion i., .- ii. and: qa.1Y, nGP perGLU DIVISIONS:, 1C 1;) - DEFINITION H.UMIKH SOO1NOTSVYY1 I1m El.m. . After expolition:; os.-folio1 pole -.- m ilenkn with ... bHOH (); :: he.vodnts nprsuMeiiio and 11i; xC, 1i film.

Similarly, the following is manufactured: 1 film with a vertical uiKn .-. Ofi, 1 -:. Preparation of a film with the same film Ht is the basis of u.j.x difficulties. Three negatives, okaktononye on glass, can be found for almost unlimited exposure meters, but the method of conventional copying of transparencies, for example, on a plate with a thick layer rich in silver.

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gradations of the horizontal scale and 10 gradations of the vertical scale, with the increasing density of the horizontal gradations corresponding to a progression with a denominator of 1.5, and vertical gradations with a denominator of 2.0. By introducing a vertical seroP scale, the exposure, for example, in 40 seconds. Passes unhindered only through the transparent line, indicated by the number 40, and through the remaining lines, more and more opaque, passes less and less singing ;.

The use of the light meter is as follows. Assume that there are several paper grades with different bromo-silver and similar emulsions. On each of these emulsions, an imprint-photogram should be made with a specific exposure from an ex-uunometer, using as ictM-yes with negagi, copying). For each type of emulsion, a photogramme will be obtained from the mountains of the carpathians with an exception of 1, for example, 40, 16, 8, 4, 2, 1, / 2, / ", / S seids. Thanks to a vertical scale of 40 seconds, exposition has hit, for example, only on a gradation of about 40, the next gradation — a row of 32, hit;) an exposure of 32 seconds p.

Photographs of the pado make lime wildly on this grade paper. With the purchase of a new paper, the photogram of the exposure meter must be printed again for a new type of emulsion.

Determining the exposure for various || s. negatins are produced from these photograms in the following way: on the negative side, the darkest place is found, which is printed as "almost white," and the tag is superimposed on the viewing frame of fig. 2) eat down so that the dark place found (negative light) falls on the right window.

On the left side of the viewing frame and the exposure meter, so that the left window has one of the cells of the first horizontal row, indicated by the number 40.

a meter up and a winz (unquantized negative) can achieve a position in which the densities become rabbis.

Having shifted the display to 1 left, you can see the number of the gradation in the window. Let it be for example 12. It means that the darkest part of negatiy corresponds to 12 gradations of the exposure meter.

Next, determine the most transparent place. Dp this put a viewing frame on the table, and the negative is placed on the right with the most transparent place in a white cell with black psi; Mr. prosnecheva.maosti in both cells .. Shifting the exposure meter right, read dead transparent gradient. Let it be, for example, 3.

So, both the darkest J2 and the bright light spot of 3 Haniero are defined.

12 ,

i.e. megatai occupies 9 gradations of the horizontal scale.

In the photogram for an appropriate 1, “:” type of emulsion, they look for a horizontal line where the twelfth gradation would be almost white. This will be, for example, line 1. On this line, a third of cTpoica will be almost black, and twelve will be almost white.

Consequently, daipa emulsion is suitable for negative, and a ravia that requires an exposure of 1 second.

Comparing all the frames, it is determined which paper is most convenient for printing.

Tai :, ira first look at the difficult way, in fact, very simple and fast (and most importantly accurately and reliably) you can determine the exposure for any negative.

When selecting photo paper to negati and. They act in the same way as in contact printing, the exposure is in the following way: an exposure meter is placed in the enlarger instead of the pegative and the magnification is made once. An increase in and once is the receipt of prints in the size of a pegative with a projection print, for example, with a size of 9, 12, a print of 9 12 cm is obtained. An increase from a negative 9 X 12 cm to a size of 18 24 cm will be a twofold increase, from 9 12 cm by 27 3G cm-three times n t. l. : “It goes linear increase.

By successive tests on strips of paper, some sort of emulsion is determined how many times the light is magnified more strongly or light when contact is printed, with (-op, rum made photogram.

This experience should be given only once, the experience will be valid for all negatives, for all papers, at different degrees of magnification, but only at the same time at the source of the light.

If in one case use a magnifier with a capacitor, nlru ;; In the same case, before the condenser is stacked. Frosted or opalized glass. To calculate the coefficient of the correction, the value of the packet will increase in both cases.

Let the coefficient of the amendment be paired with the magnifier 2. Then the exposure is determined as follows: E1: the position required for the contact printing, multiply by the number taken from the correction table according to the coefficient and increase.

By printed photogram. It is possible to determine how much one type of emulsion is more sensitive than another.

The vertical density scale has a multiplicity equal to 2. Suppose that a pas has two types of emulspi, we print photograms with an exposure of 40 seconds for both grades and show them together, i.e. at the same time, and after drying the photograms. results.

If line 2 was printed on the first photogram in the same way as the second line 1 on the photogram, then the first emulsion has half the sensitivity. The contrast is clearly visible and can be calculated by the number of radios printed in one line.

Focused on the results of the material contrast and sensitivity determination based on photograms, the selection of the required material is the same as for copy-print printing.

Lt sravponi work of various prodovol, V.1PNIIPI pkmochn, methyl fv-Ali, temperature and degree of dilution of the developer with water for a continuation of 1 st time: laziness and the nature of the resulting production on one of the following: 40 seconds) and two photograms are captured (or bulbs (and 1 pho are for one odd replica of the first 10% of the exhibitors. f 1o kysykhanin photograms are compared to and computed by printing the gradation.

The sranpenis of the results of the usuni and the loosening and the weakening is carried out by a simple determination of the following: to the meter to be measured by the non-account of the grad.

And with. amplifiers (, uranium G |, mercury sulfur, etc.) up to an increase in density of: jKCi 0) ioMCTpy, with reinforced (ed .x) PEG.LIVS printed transparencies and psi; Schlits comparison with e |) B (beginning: 1ln. 1mi 1 density of megapixel, taking into account the contrast of the material, on which the film is made.

71l Oeditopoi coa (ricint (crespOSI) filming light filter per ort:) chromatic material intended for work, the pechaga - from: ia strongly weakened daylight sae two photo frames. 11: without an optical filter and with a light filter with the same time. m exposure.

After development and drying, the results are compared, i.e., the number of non-printed gradations is calculated and the multiplicity is determined as in determining the sensitivity of emulsion.

The subject matter of the invention.

I. Exposure meter using rp.idational graduated scales, characterized by the use of two heating plates one on another at an angle of 90 films, of which one film is the negative of a gray horizontal density scale, and the second; by and. L. distinguishes with adj.

vertical exposure scale. 2. Shape of exposure meter

Tpevbeii alenki with negatne many corresponding inscriptions.

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