Sony's compact APS-C wide pancake — 30mm equiv at f/2.8 in near-body-cap dimensions.
The Sony E 20mm f/2.8 (SEL20F28) was released approximately 2012 as an ultra-compact pancake prime for Sony E-mount APS-C, providing 30mm full-frame equivalent perspective. Nine elements in 8 groups. Seven aperture blades. 49mm filter thread. At approximately 69g — pancake form factor. 0.20m MFD.
Nine elements in 8 groups. Seven aperture blades. The 49mm filter thread. At approximately 69g — extremely lightweight pancake design. Minimum focus distance of 0.20m. Autofocus. f/2.8 maximum aperture. APS-C image circle (30mm equivalent). Sony E mount.
The E 20mm f/2.8 provides the most compact lens configuration for Sony E-mount APS-C cameras: at 69g and 29.9mm length it approaches the form factor of a body cap, enabling truly pocketable camera configurations with APS-C bodies like the NEX-3N or A5100. The 30mm equivalent provides a near-normal wide perspective. The 0.20m MFD enables close foreground compositions.
On the used market the Sony E 20mm f/2.8 is affordable as a compact APS-C pancake prime. Condition checks: AF response, 49mm front element for marks. APS-C only. Compatible with Sony E-mount APS-C bodies.