SU489069A1 - Exposure Line - Google Patents

Description

(S4) EXPONOMETRIC RULER

FIELD OF THE INVENTION The invention relates to film photographic equipment, namely, to ExponentMetriv. The 3KcnoHOMeTpjraecKHe line of rulers, containing the case with the main sliders and scales of relative apertures, the diaphragm of the object's illumination and reflection coefficients, and the negative sense graph of the chart, do not provide an implicit and accurate definition of the nature of the future. For an accurate and accurate determination of the nature of the future image, we offer an exponential exposure line with interchangeable positive sensitograms installed parallel to the main sliders between the body projections, on which the sensitometer features scales are applied, and the object brightness-brightness scale is located above the projections on an additional engine equipped with a tinted black porridge the viewing window of the cupboard and the hinged dairy ostina; FIG. 1 shows the proposed line without sensitograms, open view; on . figure 2 - slider line; on fng.Z case line; on fn.4 - ruler with sensitogram, general view. The following concepts are accepted in the drawing: 1 - the body of the ruler with the basic paes and scales, 2 - relative descriptions ((diaphragm plates; 3 - 5fcness - illumination of the object; 4 - reflection coefficient, 5 - negative, 6 - positive sensitization, 7 - Cases 1 with scales of axes of the sensitometer, 8 - windows of the observation with black porridge 9 krllm, 1O - hinged milk dvl.Vr. The device works as follows. i Before shooting on the main engine, the negative sensitogram 5 is correspondingly one of .3} TL sensitograms 6, pre-printed with a negative sensitogram with optimal | light and processed from a certain p & sex. Negative sensitogram of a ustd (bring the engine, respectively, UIAUJIC os {material sensitometer 7). density, chosen by the individual, or based on the recommended values of key densities of nG (1 pa in the values of densities on the engine with a negative sensitogram 5. The indicated densities are parallel in m negative sts. If the key field received an EXPOZY1 of 1.25 lux / s, in addition to the carrying aperture of a glafragm of 1, for a jerk of 1.50 s, the brightness of the object's object should be 1.25 x 4 x 50 250 abs; d of these components of components 250 abs D | ) t HClIlrlDIVV IWIVlilUnd i Wt E 1SP Ch314L g D, scales of 11 will be indicative, When shooting, for example, with a diaphragm of 1: 6.3, this index is set to 250, then under each field of the negative sensitogram 5 defined by Negative density will be 30 of the relevant luminance of the corresponding areas of the object, by combining the value of the reflection coefficient of the surface of the main section by means of an additional double 11k with the key brightness 3 under the reflection coefficient equal to 1, the necessary balance can be read on the scale. Having determined the possible aerial views of the main airborne troops and combining: lx in the window of the upper slider, one can see visually their ratio against the background of the hinged milking layer / not 10 in the diffuse or reflected light flux from the main the source of the object. The subject was invented by an exposure meter, comprising a body with main sliders and a scale; the relative aperture of the diaphragms, .... ..w. "H..mm.p. 4 Mtf of the object lightness and reflection coefficients and negative sensitogram, characterized in that, in order to thoroughly and accurately determine & dividing the character of the future image, it is equipped with interchangeable positive sensitograms, which are parallel to the main engines between the projections of the body on which The scales of the sensoritometry are applied, and the scale of the rcoo | tei-illumination of the object is located on the additional slider on the additional slider, equipped with a tinted black porridge, and a ball; vrno fixed milk plate

V Ate-w, О J2 ie rt in if µ has; and S 8 8 a

j J.J 2 (.5 f ig S3 S §

 Th

 W

yy «5« a

3

0

“A

. “M o

"S