Sony E body + Canon EF lens
COMPATIBLE MF AF AA SB MAC TS
If you feel no need for electronic feedback, the "basic" adapter will create a simple mechanical contact between the EF lens and Sony E frame. This means that you won't be able to adjust the aperture settings on the lens, since it's electrically controlled, which could be a nuisance. There won't be any autofocus either.
To use your Canon lens to its full capabilities, you'll need adapters with electric signal transfer. This means that the adapter has to have a signal compiler that can translate "Sony language" to a "Canon language". Fortunately, they are widely available.
Prices vary greatly, from the cheapest Fotga ($ 60-70) through mid-range Viltrox and Commlite ($ 80-100) or semi high-end Techart ($ 300) to the professional Metabones high-end adapters ($ 400) with its own updateable firmware.
More advanced versions, like the Metabones, constantly receive firmware updates, enabling more functions, like seamless aperture control or additional AF modes.
Professionals are better off buying a high end adapter with better support and more advanced firmware.
Autofocus with A7 and Canon lens.
The most important details here don't lie in the adapter rings, however there is some difference between their capabilities, but the cameras themselves. The sensors in both the plain A7 and A 7II cameras are capable of contrasting focus and phase shift focus. The cameras can operate these functions on native Sony or other dedicated lenses, but third party hardware is a different question. Until recently (firmware v. 3.1), the Sony A7 can only opeate contrasting focus on Canon lenses, while the A7II can hadle phase shift focus too. Needless to say that the difference between the speed of the two systems is huge (anybody who had to shift focus modes knows what's this about).
In the video below, different capabilities are demonstrated with EF 24-105 f/4L, EF 70-200 f/4L and EF 50 f/1.8 STM lenses, and it's clear that the A7II can handle Canon lenses effortlessly (the plain A7 also can, but much slower).
When will a pdAF capable firmware come out for the A7 is a good question, but a petition is already underway.
Beside the three aforementioned lenses, the Fotga adapter, Sigma 12-24 made for Canon, the 1.8/50 II, 1.4/50 USM and EF-S 18-55 (non-IS) can handle AF (above 28 mm vignetting will cease with the latter, e.g. it can cover the fullframe sensor).
It's important to know that although EF-S lenses can be mounted with these adapters, they won't be able to cover the fullframe NEX sensor (with some exceptions, like the 18-55 zoom range), since they were designed for the smaller APS-C sensors. You'd better turn on the A7 cameras' built-in CROP mode.
Beside the previously mentioned Fotga, a recent test showed that the Viltrox III adapter has a significantly better quality and compatibility. Read more in tihs separate test.
Not long ago, Sigma made a leap towards the E bayonet lock: 15 fullframe and 4 APS-C, Canon EF lenses were supplied with an adapter, the MC-11, with full NEX support. The 4 native E bayonet Sigma lenses also received better support. The price tag of the converter - compared to the Sigma lenses' price - isn't excessive, around $ 300.
The solution, according to the manufacturer's promises, works properly on FF and APS-C bodies with the proper lenses. After connection, the original lens firmware will be overwritten, practically translating the "language" of the Sony camera. The adapter itself can be updated, installing the downloadable updates will allow compatibility with more Sigma lenses (compatibility of hardwer is shown by a feedback LED).
The MC-11 can not only accept Sigma ART and other lenses, but any EF bayonet lock lens. Experiences vary with these, but it's not a surprise, since most manufacturers keep their own products' support in priority (they never intended building an unviersal adapter). Despite this, EF 70-200 f/4L or EF 70-200 f/2.8L non-IS lenses perform exceptionally well. A longer test of Sigma lenses and the MC-11 can be found ide here.
Another interesting adapter for the EF-NEX is atilt-shift adapter. Find them here:
A further option, the macro adapter comes with an adjustable ring, which allows to increase distance between the lens and the sensor. This quasi-macro mode will leave you without infinity focus, but the near focus point will be closer. The imaging won't be altered much by this. Macro adapters can be found on eBay:
Last but not least, speedbooster adapters come with an extra lens, that shrinks the fullframe E image to the APS-C sensor's size (A6000, A6300, A6500) with some loss of quality. AF and manual versions can be found here:
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