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) is a compact wide-angle pancake for Sony APS-C E-mount, providing 30mm equivalent at f/2.8. At just 69g it is one of the smallest interchangeable lenses ever made — barely thicker than a body cap.
Optically adequate — sharp from f/5.6 with acceptable f/2.8 performance for casual use. The ultra-compact design makes optical compromises. The 30mm equivalent is a useful slightly-wide perspective for everyday shooting. Quiet AF motor.
Sony E mount with 49mm filter thread. Just 69g — near body-cap dimensions. APS-C coverage. No weather sealing. Minimum focus distance 20cm. The ultra-thin profile makes any A6000-series camera genuinely pocketable.
Available used very cheaply. The optical quality is basic — the Sigma 19mm f/2.8 DN Art and Sony 20mm f/1.8 FE are much sharper. The compactness is the sole attraction. For those wanting the most pocketable A6000-series setup possible.