Leica M3 Instruction Manual.  type_Optical Remote autofocuses on any camera with

autofocuses on any camera with a screw drive

This configuration is also useful for mounting where single-axis levels won't read correctly- for example

1 Arri 300W light

and 6x12 images on 120 rollfilm

diaphragm is clean

Leica M3 Instruction Manual. &nbsptype_Optical Remote autofocuses on any camera withOriginal Leitz instructional manual for the M3. English language copy. Complete, but may include annotations, highlighting, etc., which do not impede readability. Image is for illustrative purposes only, actual item may differ from that pictured. In regards to condition: Excellent like new. Good some minor signs of wear. Acceptable notable or significant signs of wear.