Lens mount and sensor formats
Sony lens mounts A and E

Sony produces cameras with two lens mount systems: A-mount and E-mount. A-mount is standard on Sony unique Translucent Mirror type camera bodies, while E-mount is used on mirrorless bodies.

Lens mount differences

A-mount and E-mount features

A-mount cameras with Sony Translucent Mirror Technology offer the advantages of full-time phase-detection autofocus. The short flange back distance of mirrorless E-mount models makes it possible to design compact, high-performance bodies and lenses that offer outstanding handling and mobility.

inside of A-mount camera

[1] Lens mount  [2] Flange back distance  [3] Translucent Mirror  [4] Image sensor plane

inside of E-mount camera

[1] Lens mount  [2] Flange back distance  [3] Image sensor plane

Image sensor size

Full-frame and APS-C formats

Both A and E mount cameras have full frame and APS-C sensors options. Among the many sensor sizes in common use, full-frame is considered to be a large format while APS-C is a medium format. Both are popular for their individual advantages.

* All measurement is approximate

Lens and sensor combinations

Sony offers full-frame and APS-C lenses with image circles that cover the corresponding sensor formats. Although lenses are usually chosen to match the sensor format, different combinations can be used to vary the crop area and angle of view when wider coverage or extra telephoto reach is desired.

* Images are for illustration purpose only.