Tamron announced the 20mm F/2.8, 24mm f/2.8 Di III OSD M1:2, and 35mm f/2.8 Di III OSD M1:2 back in October last year.
- Wide-angle prime is designed for full-frame Sony E-mount mirrorless cameras, however, is also suitable for use with APS-C models where it provides a 30mm equivalent focal length.
- Modestly bright f/2.8 maximum aperture strikes a balance between being suitable for working in available lighting conditions and realizing an impressively compact and lightweight profile.
- Three LD (Low Dispersion) elements reduce chromatic aberrations and color fringing in order to produce increased clarity and color fidelity.
- One molded glass aspherical element suppresses distortion and spherical aberrations for greater sharpness and more accurate rendering.
- BBAR (Broad-Band Anti-Reflection) coating has been applied to lens elements to reduce surface reflections and prevent lens flare and ghosting for increased contrast and color accuracy.
- Ideal for close-up shooting, this lens offers a half life-size 1:2 maximum magnification along with a minimum focusing distance of 4.3″ to suit working at near distances.
- OSD stepping motor offers especially quiet, fast, and precise autofocus performance along with full-time manual focus override.
- A moisture-resistant construction benefits this lens’ use in inclement conditions, and a fluorine coating has also been applied to the front lens element to protect against dust, dirt, and smearing.
- Rounded seven-blade diaphragm contributes to a pleasing bokeh quality.
The 20mm f/2.8 Di III OSD M 1:2 is a flexible wide-angle prime designed for full-frame Sony E-mount mirrorless cameras. This lens uses a modestly bright maximum aperture to achieve a small and lightweight profile that is ideal for every day, walkaround shooting.
Also contributing to its versatility is a half life-size 1:2 maximum magnification ratio and 4.3″ minimum focusing distance for working with close-up subjects. An OSD stepping motor achieves fast and near-silent autofocus performance along with full-time manual focus override. Additionally, the lens sports a moisture-resistant physical design along with a fluorine coating to suit working in inclement conditions.