Home  Donate  New  Search  Gallery  Reviews  How-To  Books  Links  Workshops  About  Contact

Canon EOS-M Adapter
EF lenses on EOS-M (2012-today)

© 2013 KenRockwell.com. All rights reserved.

Intro   Specs   Performance   Compared   Recommendations

Please help KenRockwell..com

Canon EOS EF-EF-M Adapter

Canon Mount Adapter EF-EOS M (allows all EF and EF-S lenses to work on EOS-M cameras, 5.4 oz./154g, about $200). enlarge. This free website's biggest source of support is when you use these links, especially these links directly to it at Adorama or at Amazon, when you get anything, regardless of the country in which you live. Thank you! Ken.


Canon EOS EF-EF-M Adapter

Canon Mount Adapter EF-EOS M on an EOS-M.


January 2013    Canon Reviews   EOS-M Review   EOS-M System    All Reviews


Introduction       top

Intro   Specs   Performance   Compared   Recommendations

Adorama pays top dollar for your used gear.

B&H Photo - Video - Pro Audio

This Canon EF-M Mount Adapter lets any EF or EF-S lens mount and work perfectly on EOS-M cameras.

It works with all Canon autofocus lenses made since 1987. I tried with a 1980s EF 50mm f/1.8 which worked perfectly, as well as the classic EF 35mm f/1.4 L and the hot new EF 24-70mm f/4 IS.

Autofocus, Image Stabilization, automatic aperture control and full and complete EXIF data transfer all work flawlessly, which means they work exactly as if they were native EF-M lenses.


Compatibility and Formats

This only works to adapt traditional Canon EF and EF-s lenses to Canon's new EOS-M series of cameras.


Specifications         top

Intro   Specs   Performance   Compared   Recommendations



Canon calls this the Canon Mount Adapter EF-EOS M.

EF means "electronic focus," meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF. These are the lenses which attach to the front.

EOS-M means that it adapts these lenses to an EOS-M camera attached to the back.


Optics       top

None, there's just air inside.


Canon EOS EF-EF-M Adapter

Front, Canon Mount Adapter EF-EOS M.



Yes, there is complete electronic communication for AF to work.


Automatic Aperture Control

Yes, there is complete electronic communication for the diaphragm to work.


Image Stabilization

Yes, works perfectly.


Data Transfer

Yes, there are 8 or 9 gold contacts on both ends to couple everything perfectly to and from lens and camera.


Tripod Socket

Canon EOS EF-EF-M Adapter

Bottom, Canon Mount Adapter EF-EOS M.

The tripod socket unscrews.


Weight       top

5.440 oz. (154.2g), measured.


Caps       top

Standard EOS body cap, included.

EB rear "dust cap," included.


Case       top

LP811 sack, $24.

I'd use a tube sock instead.


Quality       top

Made in Taiwan.


Canon Product Number        top



Introduced       top

23 July 2012.


Shipping Since       top

Late 2012.


Price, USA        top

2012 July - 2013 January:$200.

Canon EOS EF-EF-M Adapter

Box, Canon Mount Adapter EF-EOS M.


Performance       top

Intro   Specs   Performance   Compared   Recommendations

Canon EOS EF-EF-M Adapter

EF 35mm f/1.4 L on Canon Mount Adapter EF-EOS M on an EOS-M.


Canon EOS EF-EF-M Adapter

EF 35mm f/1.4 L on Canon Mount Adapter EF-EOS M on an EOS-M.

As covered above, all data, Image Stabilization, apertures and autofocus all work perfectly with this adapter. Canon's EF lenses have always communicated, focused, stopped down and operated purely electrically, so it's no big deal that Canon was able to engineer this adapter to let the big lenses work flawlessly on the smaller cameras.

Of course autofocus performance is limited by the EOS-M cameras.

The adapter is very, very tough. It's all metal; not some plastic-bodied piece of crap. Canon knows others will come out with copy-crap products, and this one is built like a tank as it should be.

The serial number is engraved in black on the barrel near the camera's mount.

The all-metal tripod foot unscrews.

Canon EOS EF-EF-M Adapter

Rear, Canon Mount Adapter EF-EOS M.


Compared         top

Intro   Specs   Performance   Compared   Recommendations

This adapter is built tough. I'm sure there will be crummy ones sold for a few dollars direct from China over eBay, however my experience with those sorts of adapters has been that they are not made to tight enough mechanical tolerances so that infinity focus is a hair off, and therefore that most lenses with internal focus or zooms will never operate at peak performance. Likewise, copy products will never feel as good, work as smoothly or be as well built.

If you're a hobbyist, who cares, but if you do this for a living, $200 is well worth it not to waste any time with substandard products. (See Is It Worth It.)


Recommendations       top

Intro   Specs   Performance   Compared   Recommendations

There are only a few lenses native to the Canon EOS-M. To use any other lenses, you need this adapter.

The native EOS-M lenses are much smaller than any other lens used with this adapter. Don't get this adapter to use an old EF-S 18-55mm lens; the combo is too big, and the EF-S 18-55 isn't as good optically as the native EF-M 18-55mm lens.

Unlike most other adapters offered by other camera makers, Canon is the only camera maker with all-electronic lenses worthy of adapting both old and new (Nikon's lenses still use mechanical diaphragm linkages from the 1950s, and Fuji never made any electronic SLR lenses, for instance). Every other camera maker's adapters are kludges which lose a lot of features since the older lenses being adapted use more primitive technology than Canon's EOS system. This EOS-M adapter is flawless because Canon's EOS system is so well integrated; Canon's all-electronic EOS system of 1987 was decades ahead of its time.

If you've found the time I've spent sharing this professional review helpful, this free website's biggest source of support is when you use these links, especially these links directly to it at Adorama or at Amazon, when you get anything, regardless of the country in which you live.




Help me help you         top

I support my growing family through this website, as crazy as it might seem.

The biggest help is when you use any of these links when you get anything, regardless of the country in which you live. It costs you nothing, and is this site's, and thus my family's, biggest source of support. These places have the best prices and service, which is why I've used them since before this website existed. I recommend them all personally.

If you find this page as helpful as a book you might have had to buy or a workshop you may have had to take, feel free to help me continue helping everyone.

If you've gotten your gear through one of my links or helped otherwise, you're family. It's great people like you who allow me to keep adding to this site full-time. Thanks!

If you haven't helped yet, please do, and consider helping me with a gift of $5.00.

As this page is copyrighted and formally registered, it is unlawful to make copies, especially in the form of printouts for personal use. If you wish to make a printout for personal use, you are granted one-time permission only if you PayPal me $5.00 per printout or part thereof. Thank you!


Thanks for reading!



Mr. & Mrs. Ken Rockwell, Ryan and Katie.


Home  Donate  New  Search  Gallery  Reviews  How-To  Books  Links  Workshops  About  Contact

August 2012