With Canon, unfortunately you do not have this option as their dumb adapter has an aperture blade on it. This will cause vignetting as you stop down, whereas the Nikon dumb adapter controls the lens's actual aperture blade!
There are quite a few Canon to M 4/3 adapters available. I haven't tried either the Metabones Speedbooster, their "regular" $400 adapter, or others. I am still researching first.
One adapter I am very interested in is the Kipon Canon EF to M 4/3 auto focus adapter. It runs about $289 at Adorama. The early tests in May showed pretty fast auto focus on some Canon lenses. Apparently it is still being updated as time goes on with new firmware to to improve performance with other lenses. It also supports in camera aperture control and IS.
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I bought a $100 Fotodiox Pro AF adapter for Canon EF to Sony E Mount. That provides AF, camera controlled aperture, and IS on most lenses (with a few exceptions.) The Contrast Detect AF is pathetically slow on the A6000, as it is with the $400 Metabones adapter. But I bought or for the aperture control. The $100 Commlite Canon to NEX adapter is about the same in performance. They also have Canon EF to M 4/3 adapters that you could look at.
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According to some of what I am reading, Canon lenses are easier to adapt to other platforms than Nikon in some cases. Apparently Nikon still uses a lever on some lenses, while Canon are completely electronic? At least according to EOS HD here:
With the EF version of the XL adapter, aperture control is on the camera side. Whilst the Nikon mount version of the Sigma 18-35mm F1.8 relies on a mechanical lever to drive aperture control, the Canon version is electronic so much more convenient and the aperture is reported to the camera, turning up on metadata.
The Canon Metabones Speedbooster also now includes auto focus, where I don't think that is available in the Nikon version? If we keep getting advances in M 4/3 AF performance, and keep getting better adapters, we might actually be able to use our Canon lenses as "almost native" in a year or tow. That would be fantastic, I am so tired of buying into new lens systems - Canon, Nikon, Nikon 1, Canon EOS M, Sony E, Sony FE, Fuji, Panasonic ....
All of this based on my reading/ research. I am new to Panasonic about 1 month ago, I am just getting ready to make an adapter purchase myself. I may try the Kipon first, then the Metabones.
I have a pretty full Canon kit, and a fairly limited Nikon one. On the Canon side I have the 24-70 2.8 II and 70-200 2.8 II, 17-40 4.0, 70-200 4.0, plus 24 mm, 28 mm, 40 mm, 50 1.8, and Sigma 50 1.4 that I use as a portrait lens on APS-C.
Thanks for the info and discussion all!
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Best,
Michael