Hugo meyer rangefinder model no. 2 registration#
The Soviets later adopted the LTM mount for their Zenit single-lens-reflex (SLR) cameras, though with the longer optical registration of 45.2 mm, required to allow the mirror room to flip out of the focal path when a picture was taken. True LTM lenses have a flange focal distance of 28.8 mm, though this is of little importance for lenses used on bellows enlargers. Early Canon cameras also used a different M39 × 24 tpi thread mount, called "J-mount".
The Soviets in the 1930s produced their early FED cameras in M39×1 (39 mm by 1 mm DIN thread). The Royal Microscopical Society (RMS) thread, also known as society thread, is a special 0.8" diameter x 36 tpi Whitworth thread used for microscope objective lenses and Leitz was a major manufacturer of microscopes, so the tooling at the plant was already set up to produce the Whitworth thread form. Whitworth threads were then the norm in microscope manufacture.
True Leica Thread-Mount (LTM) is 39 mm in diameter and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of Whitworth thread form. It is also the most common mount for Photographic enlarger lenses.
The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas.
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