Product information "Sony 20mm f/2.8 alpha A-Mount"
The Sony 20mm f/2.8 AF Lens is a wide-angle lens with excellent accuracy and extraordinary depth of field. It delivers a super-wide 94° angle of view, corrects visual aberrations from about 10" to infinity, and provides deep depth-of-field for complex shots that maintain sharp focus in both close foreground and far background.
Mounted on the Sony α (alpha) DSLR-A100 camera, this lens provides a 30mm focal length (35mm equivalent).
Rear Focusing System
Lens elements at the rear of the lens move to increase auto-focus speed and help you catch quick action.
7-blade Circular Aperture for pleasing defocused effects