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Sony E body + Canon FD lens

COMPATIBLE MF MA SB MAC

Such a possibility has been long overdue, now you can snap on FD lenses on fullframe digital bodies.

The correction length (the difference between flange focal depths of the systems) is 24 mm. This means a lot of space to house the parts of the FD lens within the adapter (this comes in handy, because the diaphragm of the lens has to be operated by the adapter ring).

Speaking of aperture control: FD-NEX adapter rings have another extra feature: the aperture control can be switched at a moments notice independently between the pre-set value or fully open mode by choosing between OPEN-CLOSE.

Adpaters are really simple, a tube contains the aperture ring and the FD bayonet lock is bolted on. Its price goes from $ 15-20, from cheap ones to professional solutions (all of them can be used on fullframes, since the FD is a fullframe format).

Another 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 FD image to the APS-C sensor's size (A6000, A6300, A6500) with some loss of quality. AF and manual versions can be found here:

The "Canon FD bayonet" may actually refer to three different things, and although these mean no difference in using the adapter, they're worth a mention. The FL bayonet was the predecessor of the FD and could have been fitted on cameras (and adapters) using the FD bayonet lock. The FD bayonet has two versions: FD and nFD. The original FD has a breech lock, which means that only the silver ring on its end of the housing moves when fixing it (it doesn't have a lug, it tightens onto the bayonet lock). In the case of the nFD the whole housing of the lens turns when fixing (similar to a modern EF lens), but the bayonet itself doesn't turn inside the compartment (and has a safety release as well). There are 134 types of FD and 33 types of FL lenses, all of which can be with all kinds of FD adapter rings.

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Terminology

In terms of compatibility, we distinguish four separate categories:

COMPATIBLE
PARTIALLY COMPATIBLE
COMPATIBLE IN THEORY
NOT COMPATIBLE
This means that you'll be able to apply the lens on the camera in question with a proper adapter, and full focus range will be available with it (often with aperture control too). If AF is supported, you'll see it in the description.
This means that due to the flange focal depth or other factor this conversion would be normally unfeasible, but with some compromises (e.g. using a speedbooster adapter) can be made possible.
This means that the flange focal depth should make mounting and using inifinty focus possible, but for some reason there are no adapter rings available or other factors make it unviable.
This means that you won't be able to mount your lens due to mechanical incompatibility or the difference in flange focal depth doesn't make inifinity focus possible. Although numerous lenses can be mounted on cameras without infinity focus, but this cannot be considered actual compatibility.

Additional information for compatible variations:

MF
AF
MA
AA
SB
MAC
TS
manual focus (on the lens, with its own control ring)
autofocus available (AF controlled by the camera body)
manual aperture control (on the lens, with its own control ring)
automatic aperture control (controlled by the camera body)
speedbooster (focal reducer) adapters are available
macro (variable length) adapters are available
tilt-shift (or other flexible) adapters can be used

If you'd like to read more in-depth about compatiblity, you'll need to get familiar with flange focal depth, see this article.