Voigtlander's compact ultra-wide for Sony FE — the Color-Skopar 21mm f/3.5 with electronic coupling.
The Voigtlander Color-Skopar 21mm f/3.5 Aspherical for Sony FE is the Sony mount version of the compact ultra-wide described in Leica M under ID 3584. At 21mm f/3.5, it provides dramatic wide-angle coverage in an extremely compact package. The Sony FE version adds electronic communication for EXIF and aperture control — a significant practical upgrade.
Optical performance is very good. Sharpness is impressive from f/3.5. The aspherical element provides excellent correction for 21mm. The f/3.5 is modest but adequate for landscape and architecture where the lens is typically stopped down. The electronic communication with Sony bodies makes this dramatically more practical than the mechanical-only M-mount version.
Sony FE mount with electronic communication. Filter thread is 52mm — very compact for 21mm. Weight is approximately 170 grams — extraordinarily light. Build quality is excellent Cosina precision. Manual focus with smooth helicoid. Benefits from Sony IBIS. The electronic coupling provides EXIF, aperture control, and focus magnification assist.
Available at moderate prices. Check smooth focus and clean optics. An outstanding compact ultra-wide for Sony FE. The electronic communication and IBIS support make this significantly more practical than the M-mount version. The 170-gram weight and 52mm filter thread are remarkable for 21mm on full frame.