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EF Mount Module

by AlexEnglish, published

EF Mount Module by AlexEnglish Aug 18, 2011
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EF Mount Module by AlexEnglish is licensed under the GNU - GPL license.

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This is an openscad module (also provided as an stl in case it is useful to someone) for a Canon EF bayonet lens mount. I built this as a part of a project to make a microscope adapter for my camera (which will be published soon). I hope this can be useful to others for developing pinhole cameras, macro adapters, microscope adapters, telescope adapters, replacement body covers, and other useful things.

This has been printed and tested and it works very well. Because of the overhangs of the threads on the bayonet, your print settings will have to be pretty good. You may get away with mediocre settings if you do a little clean-up work.

In this version, I forgot to include the hole that the lock pin on the camera sinks into, which means that this won't lock in place on the camera, but it should nonetheless be light tight and it does seat very snugly and securely.


Include as a module in an openscad project. The output of this file, when rendered, includes a through hole as a use demonstration. The module itself does not, and if printed would yield a solid body cap.

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Very thanks for the adapter! I use it to make my adapter and give my old projector lens a whole new life. http://www.thingiverse.com/thing:511179

EF adapter for Zeiss IKON Projector Lens (85mm f2.8)

Hi, thanks for uploading the source files! I tweaked your design and made an ordinary body cap for EF mount. Check it out: http://www.thingiverse.com/thing:287170http://www.thingiverse.com/thi...

Canon EF Mount Body Cap

Thanks Alex, I used this to good advantage to get my Eos into prime-focus on my telescope. I had to make a low-profile focuser for the scope and just by chance your adapter fitted the original focus tube nicely. See http://www.thingiverse.com/thing:267200http://www.thingiverse.com/thi... for the low-profile focuser.

Low profile telescope focuser

Thats Great! You should make into an iphone lens adapter!!

Thank you so much for this, saved me a lot of work (and cash).

Fits real good :-) Printed it to fit my camera to my fiance
és telescope... (Printed with pp3dp UP 0.3mm/fast, scaled 0.99, 1:1 is a bit too big)

I'm really glad to see this put to use.

Printed on a TOM, 1:1 fit snug, but worked well. That small of a difference might have to do with printer settings, plastic characteristics, or who knows what else. If other people report the same, I may scale it back that little bit for the next release.

I think it's fine, most people should know their printer's quirks after printing some on thingiverse :-)