GOMZ Leningrad Rangefinder Adjustment

はじめに

This guide describes how to adjust the horizontal and vertical rangefinder alignment of the GOMZ Leningrad camera.

The Leningrad has a unique split image viewfinder, where the focus patch is an independent image instead of two images stacked together. When the rangefinder cam is actuated, the patch stays fixed and the rest of the image moves.

For all screw adjustments in this guide, apply a few drops of acetone prior to turning to dissolve any fastener if the screw is seized. Do not force the screws as they are easily stripped. After the adjustments, one may opt to apply nail polish to secure the screw.

必要な工具と部品

手順1 Adjusting vertical alignment

GOMZ Leningrad Rangefinder Adjustment, Adjusting vertical alignment: 手順 1、 3の画像 1

GOMZ Leningrad Rangefinder Adjustment, Adjusting vertical alignment: 手順 1、 3の画像 2

GOMZ Leningrad Rangefinder Adjustment, Adjusting vertical alignment: 手順 1、 3の画像 3

The vertical alignment can be adjusted without disassembling the camera top cover. However, the same adjustment can be performed with the top cover off or the RF assembly extracted.
Remove the adjustment screw cover by rotating it with a lens wrench or custom tool. Note that uses a bayonet mount with no threads, so at most 90˚ rotation is needed.
Adjust the vertical alignment as needed. The same adjustment screw is used when adjusting in a more disassembled state.

翻訳

手順2 Coarse adjustment of the horizontal alignment at infinity

GOMZ Leningrad Rangefinder Adjustment, Coarse adjustment of the horizontal alignment at infinity: 手順 2、 1の画像 1

This step is only necessary if the rangefinder is significantly off horizontally.
Remove the RF assembly following the Leningrad disassembly guide.
Screw the eyepiece (blue box) back into the RF assembly for viewing during the adjustment.
Loosen the screw circled in green. Carefully shift the arm secured by the screw to adjust the mirror position. Caution: the adjustment is very sensitive.
Tighten the screw, temporarily put back the rangefinder assembly into the body. Confirm the rangefinder patch is in the correct ballpark with a lens.

翻訳

手順3 Fine adjustment of the horizontal alignment at infinity

GOMZ Leningrad Rangefinder Adjustment, Fine adjustment of the horizontal alignment at infinity: 手順 3、 2の画像 1

GOMZ Leningrad Rangefinder Adjustment, Fine adjustment of the horizontal alignment at infinity: 手順 3、 2の画像 2

Remove the horizontal adjustment cover screw (circled in red).
Mount a lens on the camera and focus to infinity. The rangefinder coupling on the lens should be calibrated.
Choose an object far away. With a 1mm flathead screwdriver, turn the adjustment screw so that the object is in focus on the rangefinder.
The location of the adjustment screw and its relative position to the cover opening is marked by the red box.

翻訳

手順4 Adjusting horizontal alignment at minimum focus distance

GOMZ Leningrad Rangefinder Adjustment, Adjusting horizontal alignment at minimum focus distance: 手順 4、 1の画像 1

Place an object 1 meter away from the rangefinder.
Focus the lens to 1 meter mark.
Based on the observation, detach the lens and adjust the rangefinder cam angle (green arrow) so that the object is in focus.
Repeat the previous steps until horizontal adjustment is correct at both infinity and minimum focus distance.