What Is An L39 Camera Mount

M39
Leitz Summicron 50 mm in M39 lens mount
Type	Screw
External diameter	39 mm
Inner diameter	North/A
Tabs	N/A
Flange	28.8 mm
Connectors	Telemeter coupling

The M39 lens mount is a screw thread mounting organization for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most mutual mountain for Photographic enlarger lenses.

Truthful Leica Thread-Mount (LTM) is 39 mm in bore and has a thread of 26 turns-per-inch or threads-per-inch (tpi) (approximately 0.977 mm pitch) of Whitworth thread form. Whitworth threads were then the norm in microscope manufacture. The Royal Microscopical Society (RMS) thread, also known as lodge thread, is a special 0.8" bore x 36 tpi Whitworth thread used for microscope objective lenses and Leitz was a major manufacturer of microscopes, so the tooling at the establish was already set up upwards to produce the Whitworth thread course. The Soviets in the 1930s produced their early FED cameras in M39×one (39 mm by one mm DIN thread).^{[ citation needed ]} Early on Canon cameras also used a unlike M39 × 24 tpi thread mountain,^[i] called "J-mountain".

True LTM lenses have a flange focal altitude of 28.8 mm, though this is of little importance for lenses used on bellows enlargers.

The Soviets later adopted the LTM mount for their Zenit unmarried-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 motion picture was taken.

The mount was developed by Oskar Barnack at Leica to provide a system that would let for the exchange of lenses on their new small flick cameras (Leica Blazon 1 and Leica Type two), every bit Zeiss Ikon had indicated that their forthcoming Contax rangefinder cameras would accept interchangeable lenses. The LTM system was tested at the request of Leitz on lenses manufactured in pocket-sized batches past Hugo Meyer in Germany and marketed with a run of Leitz cameras by A. O. Roth in London. The exam marketing program was a success, then regular production with Leitz camera bodies and lenses was introduced on the Leica II, and featured on the Leica Standard and Leica Three.

Until the 1970s the 39 mm mountain was the norm for exchangeable lenses in rangefinder cameras. The high cost of quality lenses led to the dual use camera/enlarger of the lenses, hence the fact that enlargers also accept 39 mm lenses.

Currently, Cosina in Nippon — many of whose recent products are marketed under the Voigtländer make — and FED in Ukraine continue to produce camera bodies using a true Leica thread-mountain. These give amateurs the rare take chances of having a very professional person camera past combining a used Leica lens with an M39 body at a price well below a real Leica combination. On the other paw, one has to exist conscientious as there are some issues with some bodies not using the same focusing arrangement. Adaptors are bachelor to utilize M39 lenses with modern digital cameras, such as the Canon EF-1000, Sony E or Nikon Z mounts.

References [edit]

^ [1]. Canon Camera Museum

Sources [edit]

Dante Stella
(in Russian) Standard: GOST 10332-63
(in Russian) Standard: GOST 10332-72
Marc James Minor. Non-Leitz Leica Thread-Mountain Lenses: a 39mm Diversity. Rita Wittig, 1995.

Source: https://en.wikipedia.org/wiki/M39_lens_mount

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