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- M39_lens_mount abstract "The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses.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. Whitworth threads were then the norm in microscope manufacture. 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. The Soviets in the 1930s produced their early FED cameras in M39×1 (39 mm by 1 mm DIN thread).[citation needed] Early Canon cameras also used a different M39 × 24 tpi thread mount, called "J-mount".True LTM lenses have a flange focal distance 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 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.The mount was developed by Oscar Barnack at Leica to provide a system that would allow for the exchange of lenses on their new small film cameras (Leica Type 1 and Leica Type 2), as Zeiss Ikon had indicated that their forthcoming Contax rangefinder cameras would have interchangeable lenses. The LTM system was tested at the request of Leitz on lenses manufactured in small batches by Hugo Meyer in Germany and marketed with a run of Leitz cameras by A. O. Roth in London. The test marketing program was a success, so regular production with Leitz camera bodies and lenses was introduced on the Leica II, and featured on the Leica Standard and Leica III.Until the 1970s the 39 mm mount 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 Japan — many of whose recent products are marketed under the Voigtländer brand — and FED in Ukraine continue to produce camera bodies using a true Leica thread-mount. These give amateurs the rare chance of having a very professional camera by combining a used Leica lens with an M39 body at a price well below a real Leica combination. On the other hand one has to be careful as there are some issues with some bodies not using the same focusing system. Adaptors are available to use M39 lenses with modern digital cameras, such as the Sony E mount.".
- M39_lens_mount thumbnail Leitz_Summicron_50mm_M39_3798.jpg?width=300.
- M39_lens_mount wikiPageExternalLink compat.html.
- M39_lens_mount wikiPageExternalLink qa-gost10332-63.html.
- M39_lens_mount wikiPageExternalLink qa-gost10332-72.html.
- M39_lens_mount wikiPageID "4533342".
- M39_lens_mount wikiPageRevisionID "541321737".
- M39_lens_mount caption "Leitz Summicron 50 mm in M39 lens mount".
- M39_lens_mount connectors "Telemeter coupling".
- M39_lens_mount externalDiameter "39.0".
- M39_lens_mount flange "28.8".
- M39_lens_mount hasPhotoCollection M39_lens_mount.
- M39_lens_mount imageName "Leitz Summicron 50mm M39 3798.jpg".
- M39_lens_mount innerDiameter "N/A".
- M39_lens_mount mountName "M39".
- M39_lens_mount tabs "N/A".
- M39_lens_mount type "Screw".
- M39_lens_mount subject Category:Lens_mounts.
- M39_lens_mount comment "The M39 lens mount is a screw thread mounting system for attaching lenses to 35 mm cameras, primarily rangefinder (RF) Leicas. It is also the most common mount for Photographic enlarger lenses.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. Whitworth threads were then the norm in microscope manufacture.".
- M39_lens_mount label "M39 lens mount".
- M39_lens_mount label "Monture M39".
- M39_lens_mount label "Резьбовое соединение M39×1".
- M39_lens_mount sameAs Monture_M39.
- M39_lens_mount sameAs m.0c7j_y.
- M39_lens_mount sameAs Q2496688.
- M39_lens_mount sameAs Q2496688.
- M39_lens_mount wasDerivedFrom M39_lens_mount?oldid=541321737.
- M39_lens_mount depiction Leitz_Summicron_50mm_M39_3798.jpg.
- M39_lens_mount isPrimaryTopicOf M39_lens_mount.