User manual LENINGRAD 2

[. . . ] www. stereokotoucky. cz Lightmeter Leningrad 2 - Manual Photoelectric lightmeter Leningrad 2 is intended for definition of exposures and a diaphragm at photographing on black and white and color negative materials. With light meter it is possible to work at bright solar and artificial light, on open air and in a room. PRINCIPLE OF ACTION AND DESIGN Photoelectric lightmeter is consist of a selenic photo cell, the microammeter (the measuring mechanism) and the report device . Under the action of light in a circuit of a photo cell, which is connected to the microammeter, the current is appearing. [. . . ] At definition of exposure by this method a window of light meter is necessary to direct from a place of shooting on shooting object, and the photo cell should be sunk. 2. A method of falling light at which the light meter measures light falling on shooting object. At definition of exposure by this method the window of light meter is necessary to direct from the location of shooting object on to the camera. The photo cell should be sunk, and dairy glass is inserted into a window. If the deviation of an arrow will be small, it is necessary to remove dairy glass from a window and to put forward a photo cell. The light meter will give wrong indications if to insert into a window dairy and to put forward a photo cell. For promotion of a photo cell it is necessary to turn board against the stop clockwise and to drown a photo cell in the case, it is necessary to turn board also against the stop, but counter-clockwise www. stereokotoucky. cz THE OPERATING PROCEDURE WITH LIGHTMETER 1. By turning of the top disk to establish in a window of board, against red risks, the size of a photosensitivity of negative material. Depending on a method of definition of exposure, to direct the light meter or on shooting object, or on the camera and turn of the bottom disk to combine the center of the watching index with an arrow of the measuring mechanism. Against the chosen value of a diaphragm to read size of exposure or, on the contrary, against the chosen size of exposure to read value of a diaphragm. On the cameras of old releases the scale of exposures and diaphragms can differ from scales of exposures and diaphragms on light meter. In this case it is necessary to establish exposures or the diaphragm nearest to determined on light meter. If on the camera there is a scale of exposition numbers the size of this number can be defined on light meter in notch the top disk (against a triangle). At filming with speed of 16 frames in a second the report of value of a diaphragm is made against a point under number 30 of the bottom disk, at shooting with frequency 32 frames in a second under number 60 (frequency of the frames is proportional to numbers on a scale of exposures). That light of the sky at natural shootings did not bring a mistake in definition of exposure by a method of reflected light, it is recommended to incline the window of light meter to the ground. In some cases, for example at shootings, against light, on a snow, on the sea, in mountains, at work with optical filters, at non-uniform illumination, etc. , in the exposure determined with light meter, the correction factor should be entered. [. . . ] If dairy glass or safety glass in a window of light meter will become soiled, it is necessary to wipe it with clean and smooth matter. At the bottom of the case there is a table of translation of values of photosensitivities in accordance with GOST in systems ASA and DIN. Repair of light meters can be made only in workshops. THE TABLE OF TRANSLATION OF UNITS OF A PHOTOSENSITIVITY OF A PHOTOGRAPHIC MATERIAL GOST 11 16 22 32 45 65 90 130 180 250 350 500 700 ASA 13 20 25 40 50 80 100 160 200 320 400 650 800 DIN 12 14 15 17 18 20 21 24 23 26 27 29 30 [. . . ]