I'm about to acquire a Sony A6300 e-mount camera.
I wish to use various A-mount lenses with it. Sony sell their LA-EA3 and LA-EA4 adapters to interface A-mount lenses with e-mount cameras.
The LA-EA3 adapter has no inbuilt focusing system and no screw-drive AF system. It allows lenses with inbuilt focus-motors to focus using the cameras focus detection system.
The LA-EA4 adapter has an inbuilt phase focusing system and supports screw-drive AF lenses.
For A-mount lenses with inbuilt focus motors, use of the EA3 allows the full phase focus capabilities of the A6300.
For A-mount lenses with mechanical focus drive, use of the EA4 adapter allows motor driven lens focusing, and all A-mount lenses can use phase focusing.
However, with the LA-EA4 the A6300 is attached to an adaptor WHICH CONTAINS an extremely limited number of phase focusing points and the camera is 'looking through' a half stop ND filter.Ideally the A6300 would use its multitude of on-sensor phase focusing points, ignore the EA4's focusing points, and use the EA4 mainly to provide motor-focus-drive to the lens. However various on-web opinions state that in such cases the system uses the few in-adapter phase focus points and ignores the vat number of on-sensor points. This makes very little sense, but may be true.
When an LA-EA4 adaptor is used with a A-mount lens does an A6300 use the native sensor-based focusing points or are the limited number of adapter points used?
If the EA4 translucent mirror was (properly) removed would the EA4 + A6300 combination function correctly?