The reason you can't adapt E-mount lenses to your A-mount camera is the same reason you can't adapt rangefinder lenses to a dSLR--the flange distance. The flange distance is the distance from the image plane that the lens is held by the lens mount.

Faster autofocus, way way better photos in low light when using high ISO settings and/or slow shutter speeds, especially with the IBIS in-camera stabilizer (helps stabilize too nuch coffee shaky hand shots with ANY lens you put on). The A7iii will automatically go into 'APS-C' mode (unless you choose to disable that in settings) which is just a

^{Yes. It provides improved low-light performance because of the larger pixels on the sensor, not just because of the "larger sensor" itself. In crop mode, you will get the same low-light performance, but will have decreased image resolution. However, I would highly recommend getting suitable full-frame lenses; the decreased resolution in crop}

Compatible lenses for the interchangeable lens cameras. To check the list of compatible lenses for your camera, check the Lens compatibility information website. Note: A Sony E-mount camera can be attached to Sony A-mount lenses and Konica Minolta (Maxxum/Dynax) lenses with a lens mount adapter. The camera may require a firmware update.

Lens mount: E-mount ISO range: 50 to 204800 (extended) Viewfinder: 2.36m dots Sony A7III review: Performance. Good low-light results ; Effective eye autofocus ; Dependable battery life ;

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can i use e mount lenses on sony a7iii