Optek vintage soviet light meter
MADE IN USSR!
In original packaging.
Spot Meter “OPTEK” (optical exposure meters) originally produced at the Leningrad Optical and Mechanical Plant.
In the future, issued in other optical production (see. Logos in the center of the instrument). The exposure is determined by comparing the eye to the subject’s brightness meter with transparent scale (step optical wedge), parts of which have unequal density.
“Meter” OPTEK “is a small box with two rectangular openings. One of them is constantly covered with frosted glass. The second hole is provided with an opening lid, which can be seen under oblique mirror placed inside the box. Inside the frosted glass between the device and the mirror is a scale for determining the brightness objects (step optical wedge). It is a series of transparent figures (2 – 2.8 – 4 – 5.6 – 8 – 11 – 16). The scale is uniformly illuminated through frosted glass light that is reflected from objects located in front of a light meter. Each next digit of the scale has a large optical density, t. e. transmits a smaller proportion of the incident light, and therefore the brightness of the numbers, which can be seen in the white cap tilted left to right gradually decreases. If the frosted glass located in front of a small object brightness, then on the scale You can discern only the first, the most transparent numbers; the more the brightness of the object, the greater the number of digits can be discerned on the scale. The upper side of the box is calculated device (calculator). She installed a movable disc with designations excerpts in seconds and sensitivity film in units of GOST. The device is designed for speeds from 1/1000 to 15 seconds for the film sensitivity of 11 to 180 units.
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