Just did the Sigma MC-11 mod for Canon EF-S lens mount

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Stan in NH Senior Member • Posts: 1,350
Just did the Sigma MC-11 mod for Canon EF-S lens mount
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Thanks to those forum members who have posted how to get the otherwise excellent Sigma MC-11 Canon EF to Sony E mount adapter to work with the EF- S mounts.

It was getting more than a little frustrating that the MC-11 would accept the EF but not the EF-S lenses from Canon.  It didn’t make much sense to me, since they are interchangeable on any camera that uses the Canon mount.

So,  based on the advice of others who have already done this ... and claimed it worked ... I got out my screwdrivers and went to work.  The screws that hold the outer chrome ring are in there really tight, and I was unable to move them with a small Phillips head screwdriver.  Luckily, I had a ratchet set with a small enough sized head, and was able to get them to move.  I was able to lift the outer ring and the spring behind it out in one piece, exposing the black plastic cover which restricts movement of the EF-S lenses.  Four more tiny screws, and that pried out easily, exposing the electronics.  It looks like it serves no purpose other than as a dust cover for the electronics.  I did not reinstall those four screws, but put them on some scotch tape and put them in a bag with the plastic cover.  I then just reattached the spring with the outer ring.

I then tried a Canon 24mm pancake lens, a Canon 60mm, and a Canon 55-250 kit lens.  My A6400 is set up with tracking AF.  Both lenses worked no differently than native glass.  Tracking was just as fast and consistent, exposures were right on.  I tried P, aperture priority, and shutter priority.  Everything worked as it should.  The lenses did seem to fit slightly looser than before, but not enough to actually move or cause any issues.  So, I now have access to all my Canon lenses, knowing they will be completely compatible with my A6400.

This is an easy modification to recommend.  It is simple to do, the hardest part being removing those really small screws.  And, as others have said, it works beautifully with no problems that I have yet seen reported.  Finally, if you don’t like it and feel you want to undo it, all you have to do is put back the plastic inside cover and it's right back to the original configuration.

 Stan in NH's gear list:Stan in NH's gear list
Nikon Coolpix P900 Sony Cyber-shot DSC-HX90V Canon EOS 80D Sony a6400
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