“Mount adapters” are no longer only for camera geeks
5 recommended AF compatible mount adapters
Why are there so many adapters for E mount bodies?
The reason for the large number of mounts is because of the flange back (the distance from the mount surface to the image sensor surface). The flange back is as short as 18mm and other lenses can be attached easily. In order to mount the adapter, the flange back of the side of the body must be shorter than the flange back of the lens side mount.
In addition, the mount diameter on the side of the body should be larger than the mount diameter of the lens side. It is for these reasons that the Sony E mount with short flange backs and large mounting diameters are sought after.
It is also one of the reasons that Sony discloses the specifications of E mounts to third part manufacturers. In the case of other lens mounts whose specifications aren’t publicly available, third party manufacturers have to analyze the details of the camera and create protocols to pass information between the lens and the body seamlessly.
The AF compatible mount adapter is a convenient item that broadens the scope of the body and lens. It is freed of the so-called “mount restraint”, and free shooting becomes possible. It is recommended for people who own cameras from different manufacturers or those who are planning to change to another manufacturer’s mount.