Leningrad-2

Photoelectric exposure meter

Instruction manual version 1962.

1. Purpose

Photoelectric exposure meter "Leningrad 2" (type U11 / 2) is designed to determine

shutter speed and aperture (relative aperture) when photographing in black and white

and colored negative materials. The light meter can also be used for filming.

The exposure meter can be used in bright sunlight and artificial light, in the open

air and indoors.

1. Exposure scales. 6. Rotary flap. When turning the flap along

2. Aperture scale. clockwise until it stops

3. Scale of photosensitivity negative photocell.

 material in DIN units. 7. Arrow of the measuring mechanism.

4. Scale of exposure numbers. 8. Tracking pointer associated with the bottom

5. Scale of photosensitivity of the negative disk of the reading device.

material in GOST units.

2. Principle of operation and design

Measuring mechanism

 Photocell

The photoelectric exposure meter consists of selenium

photocell, microammeter (measuring mechanism) and reading device (calculator).

Light through the exposure meter window hits the photocell.

Under the action of light in the circuit of a photocell connected to

microammeter, current is generated.

With an increase in the illumination of the photocell, the current increases, as a result of which the deflection of the arrow increases

microammeter.

The shutter speed is determined using a countdown

a device that consists of two disks - the top

and bottom. The upper disc has a scale of diaphragms from

1.4 to 22, as well as sensitivity scales from 4 to 350

units of GOST and from 6 to 27 units of DIN.

Exponometer Leningrad 2 Manual 1962

- 2 -

Exposure meter window

Intermediate divisions on the sensitivity scale according to GOST correspond to 5.5; eleven; 22; 45;

90; 180; 350 units.

The lower dial has a shutter speed scale from 1/1000 to

15 seconds, with fractions of seconds indicated by whole numbers,

ie instead of ½ sec. written 2, etc. Sign ″

stands for whole seconds. The same disk contains

scale of exposure (light) numbers from 1 to 15.

Some cameras have a similar scale.

with a central shutter, for example "Iskra" and "Smena-8".

A tracking pointer is associated with the lower disc, which

moves when you turn the dial.

The light meter meets the requirements of GOST 9851–61.

3. Methods for determining exposure

There are two main methods for determining exposure with an exposure meter:

1. The method of reflected light (according to the brightness of the object), in which the exposure meter measures the light,

reflected by the subject into the camera.

When determining the exposure using this method, the exposure meter window should be directed from the spot

shooting on the photographed object, and the photocell must be recessed in the body.

2. The method of incident light (according to the illumination of the object), in which the exposure meter measures

light falling on the photographed object.

When determining the exposure using this method, the exposure meter window must be directed from the spot

location of the photographed object on the camera. The photocell must be recessed,

and a milky glass is inserted into the window. If the deviation of the arrow is small, you should

remove the milk glass from the window and pull out the photocell.

To extend the photocell, it is necessary to turn the flap clockwise until it stops,

to drown the photocell - turn the flap as far as it will go, but counterclockwise.

At temperatures above + 50 ° C, the photocell may escape

out of service. This should be borne in mind in hot conditions.

climate. It is not recommended to keep the photocell under

direct sunlight.

Prolonged exposure to bright light may

there is a temporary change in the readings of the device,

therefore open the exposure meter case in bright light

should only be taken for the time required to determine

excerpts. It is recommended to store the light meter in a closed

case, the photocell must be recessed into the case.

Light meter and milk glass are required

protect from dust, dirt and moisture.

If the milk glass or safety glass is in

the exposure meter window is dirty, wipe it

clean soft cloth.

Exposure meters can only be repaired in

special workshops

   

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