M42 Lens To Leica M Body (Techart Pro LM-EA7) Adapter

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M42 is the "universal" screw thread mount for SLRs that is usually associated with Praktica and Pentax. It was actually used by many brands, including Fujica, Mamiya/Sekor, and Zenit. Because it is an open standard and has a relatively long flange distance, it has also been a very popular mount for adapting to other mounts (notably excluding Nikon F). There are many commercial adapters for M42 lenses to other mounts, including Leica M. Ok, so why 3D print this one? Because we can seems like a decent answer -- this is an easy print in 1 piece, including the M42 screw thread. However, there are two even better reasons. The first is that an M42 to M adapter allows the latest Sony E mount bodies to autofocus these manual lenses via the Techart Pro LM-EA7 adapter... which has a 700g weight drive limit, so we don't want to waste weight on a heavy adapter. The second is that later Mamiya/Sekor M42 lenses had the aperture ring extend back around the mount flange, but commercial adapters have overly wide flanges that prevent those lenses from mounting. Actually, there is also a third potential issue in that some M42 adapters are too thick on the M side to fit on the LM-EA7. In any case, this adapter avoids all these problems. The last two shots were taken using the LM-EA7 autofocus with the manual Mamiya/Sekor 55mm f/1.8 lens shown. Note that you can shift the autofocus range closer by not leaving the manual focus ring set to infinity.

About the author:
ProfHankD
I'm a Professor of Electrical and Computer Engineering at the University of Kentucky, best known for things like having built the world's first Linux PC cluster supercomputer in 1994... although around the 3D-printing world I'm probably best known for my HingeBox (which Tested popularized). My research group (Aggregate.Org) really is about improving computing systems by making the various SW+HW components work better together, which we do for many different types of computer systems: supercomputers, digital cameras, ... and now 3D printers. I had some experience with tool and die making using Bridgeport Series I CNCs as far back as the late 1970s, but my 3D printing adventure started in late 2012 with purchase of a MakerGear M2 for my lab to make custom camera parts in support of computational photography research. I now use multiple MakerGear M2 and Wanhao I3 3D printers, several semiconductor laser cutters, a 3040T CNC mill, a programmable paper cutter, and a small vacuum forming machine.

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