Minolta SR/MC/MD Lens To Canon FL/FD/FDn Body Adapter

by profhankd, published

Minolta SR/MC/MD Lens To Canon FL/FD/FDn Body Adapter by profhankd Aug 17, 2013
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Minolta's manual-focus SLR lens SR bayonet mount was introduced in 1958 and continued as the compatible MC and MD mounts through 1998. In 1964, Canon introduced the FL lens mount for their SLRs and continued with the compatible FD mount through 1990. Through all that, there haven't been any adapters to mount one type on the other... until now.

This adapter allows a SR/MC/MD lens to focus to infinity when used on an FL/FD body -- or, more significantly now, on an FL/FD adapter for a digital camera such as the Sony NEX models. Thus, for example, if you have a bunch of old Minolta and Canon lenses, you can use them all with an FL/FD adapter, FD Lens Turbo, etc.

Be warned that this adapter does not fully lock, although the ones I've printed are all very firm fits. Use it at your own risk. On my FD Lens Turbo, the stop-down lever is amazingly close to hitting part of the Lens Turbo, and using sr2fd.stl may interfere with normal stop down. This issue is fixed in sr2fd20130818.stl, which is 0.25mm farther away from the sensor, but still getting infinity focus. As of sr2fd20130827.stl, there is now a stationary "bump" on the adapter that essentially locks the SR/MC/MD lens on the adapter (taking advantage of the material properties of PLA), but the locking action is too aggressive with some lenses and the FL/FD/FDn side is still friction-fit. This remains a work in progress until I have incorporated a complete locking mechanism....


There are overhangs in this print, and you'll probably have to use a pair of tweezers to remove a few dropped threads and work the part on an FL/FD flange a little to get things operating smoothly, but it's really not bad. Ours were printed on a MakerGear M2 in PLA with 0.25mm extrusion and between 20%-40% fill. Use a light-blocking filament -- ideally a black that gets its color from carbon black particles rather than dye, because most synthetic dyes are transparent in the NIR band, and camera sensors will record NIR.

There are two indented holes on the part: a top one for aligning the SR/MC/MD lens and a side one for aligning with the FL/FD mount. I like to paint these red using a toothpick and a little red paint.

The photos show the SR/MC/MD->FL/FD adapter, the adapter mounting a Minolta MC Rokkor 50mm f/1.7 on a Canon FTb body, and a photo taken with that lens using my FD Lens Turbo and Sony NEX-7.

Update, Dec. 8, 2013: I've now tried printing this in MatterHacker's soft black PLA. It works very nicely printing at 230C with the bed around 80C. That material is like a very opaque hard rubber, and holds dimensions well without compressing significantly (printed at 100% fill), but the flanges and locking bump seal almost like there was a hard rubber gasket there. It seems to be a very viable alternative for this type of adapter, although the printed part is hard to get off the borosilicate bed of our MakerGear M2.

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you can help me !
mount OM(olympus)-EOS canon please !

That's amazing man, I'm looking forward to 3Dprint that and try it with my minolta 1.2 58mm and speed booster! Request: Oh Please Please make the same thing for Minolta/sony A-mount Lens to Canon FL/FD/FDn Body ! I'd be so graceful! :D

Hi there profhankd. I was wondering if there is a md lens mount for canon eos body out there. Thanks!

Unfortunately, I believe Canon's EOS mount sits a little too far from the film plane to allow infinity focus. However, you can check for yourself: if pushing the MD lens as far as it will go against the EOS body flange can get you to infinity, there's a chance an adapter could be made. I don't currently have any EOS bodies -- lately, I'm all Sonys (for the better sensors and the short E-mount flange). Well, I do also have an EOS-M for use with Magic Lantern, and this adapter works fine on top of a standard FD->EOS-M adapter.

This is great. The Picture og the Nikon fd-mount camera with the Minolta lens must be first in history! I do not have a 3d printer. I Wonder if I could pay someone to print me an example of this adapter? Best, henrik

Where do i find the download file to this?

Click where it says "Download This Thing!" The newest STL file is the one to print, currently sr2fd20130818.stl .

Don't seem to have that link on the page. Everything but!

Hi Prof Hank,

It's great that there are people like you in this world! I have come across you writings in other places and it's always good. I'm going to get this printed and I have a question about the material - would it be a good idea to have this printed in metal? Are you doing it in PLA because it's cheap or is it better than metal for this adapter? Just to be clear, I know nothing about 3D printing, in case I sounded like I did there.

And just in case I do have the privilege of you answering, either way, will it be possible/a good idea to leave the Fd to e mount converter on the camera and switch out lenses without having to take the focal reducer off?

Thanks very much.