Minolta SR/MC/MD Lens To Leica M Body (Techart Pro LM-EA7) Adapter

by profhankd, published

Minolta SR/MC/MD Lens To Leica M Body (Techart Pro LM-EA7) Adapter by profhankd Aug 14, 2016
0 Share
Download All Files

Thing Apps Enabled

Order This Printed View All Apps

Design Tools


Liked By

View All

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag.

Print Thing Tag

Thing Statistics

1543Views 268Downloads Found in Camera


Minolta used to be one of the more popular brands of 135 film SLRs and lenses. In fact, they were one of the very few lensmakers making their own glass, and their lenses are well known for exceptionally consistent color -- they famously even made some lenses for Leica. Minolta introduced their SR bayonet lens mount in 1958 and, with minor variants labeled MC and MD, continued producing lenses in that manual-focus mount until 2001. (Do not confuse these with the incompatible Minolta autofocus lens mount, A, which began with the Maxxum line in 1985 and has been continued by Sony since 2006.) Because SR has a relatively short flange distance, there were not many adapters to mount SR lenses on other bodies, but adapters to various mirrorless mounts, including Leica M, are commercially available.

Ok, so why 3D print this one? Because we can seems like a decent answer -- this is an easy print in 2 pieces: the adapter and a removable lens locking pin. However, an SR 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 (this one weighs about 11g). There is also a potential issue in that some SR adapters -- but not this one -- are too thick on the M side to fit on the LM-EA7.

The last two photos were taken using the LM-EA7 on a Sony A7II with a Minolta Rokkor 58mm f/1.2 lens wide open. They are vertical shots that look much better if you click to see them in vertical orientation, rather than just seeing the horizontal crop Thingiverse makes.

Print Settings

Printer Brand:













A very straightforward print. I used "dishwasher safe" high-temp black PLA. It should be a little tight, so work a lens in the mount a bit before attaching to a camera -- that way, you can clean any little shards that the flange might cut the first time you fit a lens to it. The bayonet wings are designed to print in the given orientation without supports or post processing.

There are three files. Just printing sr_20160814.stl will give you the adapter body and two copies of the rather small lens locking pin (one and a spare). Alternatively, the adapter body by itself is sr_20160814adapter.stl and sr_20160814lockpin.stl is the lens locking pin.


Usage Notes

The M side of the adapter has a dot in the bar-patterned grip portion of the adapter that you align with the M locking pin for mounting and then turn clockwise to lock. To unmount, you simply depress the M mount release lever/tab on the body (or LM-EA7) and turn counter-clockwise, lifting the adapter out when the dot aligns.

The SR side of the mount is marked "Minolta" on the bottom and "SR" on the top. To mount a lens, simply align the red dot with the top of the adapter (between the "S" and "R"), push the lens in, and turn clockwise until the lens focus mark is at the top. The lens should turn very freely... so now it is time to insert the locking pin. The locking pin fits into the slot on the right side after the "SR" marking. Although the pin is straight, the slot is actually curved to help seal against light leaks and to hold the pin better, so it might feel tight the first time you put the pin in, and you might have to file your pin a touch if your printer was at all sloppy in making it. You might have to wiggle the lens a bit to perfect the alignment with the pin, but the pin should push in to have the tab nearly flush with the outside of the adapter -- and, more importantly, to rotationally lock the lens so it cannot move. To later remove the lens, you shouldn't need to pull the locking pin all the way out, but merely a couple of mm to rotationally release the lens.

Minolta SR/MC/MD lenses default to stop-down operation, so you control the aperture by simply turning the aperture ring on the lens.

More from Camera

view more

All Apps

Auto-magically prepare your 3D models for 3D printing. A cloud based 3D models Preparing and Healing solution for 3D Printing, MakePrintable provides features for model repairing, wall thickness...

App Info Launch App

Kiri:Moto is an integrated cloud-based slicer and tool-path generator for 3D Printing, CAM / CNC and Laser cutting. *** 3D printing mode provides model slicing and GCode output using built-in...

App Info Launch App
KiriMoto Thing App

With 3D Slash, you can edit 3d models like a stonecutter. A unique interface: as fun as a building game! The perfect tool for non-designers and children to create in 3D.

App Info Launch App

Print through a distributed network of 3D printing enthusiasts from across the US, at a fraction of the cost of the competitors. We want to change the world for the better through technology, an...

App Info Launch App

Quickly Scale, Mirror or Cut your 3D Models

App Info Launch App

Treatstock is an online platform that offers decentralized manufacturing services such as 3D printing and CNC machining for business-to-business and business-to-consumer sales all over the world. W...

App Info Launch App

3D print your favourite design with NinjaPrototype, a professional 3D manufacture with consistent quality and speed.

App Info Launch App

Thanks for the adaptator, i use the base to attach a telescope oculaire (plössl 9mm) in my 500mm objectif

I printed this adapter for a friend and we found that it fits a little loose. The circumference of the adapter is fine, I believe the little tabs that hold it in place could be just a little thicker. Could you provide the original files so I can make the necessary edits?