SUMMARY
Tamron's new 12-20mm f/2.8 lens for full-frame cameras provides an expansive field of view and a constant f/2.8 aperture, enhancing capabilities for astrophotography and low-light shooting. The lens incorporates Tamron's VXD autofocus motor for quick and silent operation and includes premium features like an aperture ring, zoom lock, and a USB-C port for firmware updates. While sharpness is excellent in the center and good in the corners at 12mm, the 20mm end requires stopping down for optimal corner sharpness. The lens demonstrates minimal coma, a crucial factor for astrophotographers, and offers a close minimum focus distance for creative compositions. Despite its premium price and some minor finish concerns, the lens is recommended for its unique combination of ultra-wide reach and brightness.
TAKEAWAYS
The Tamron 12-20mm f/2.8 lens offers a wide 12-20mm zoom range with a constant f/2.8 aperture.
It is well-suited for astrophotography due to its minimal coma performance even at f/2.8.
The lens features advanced controls including an aperture ring, zoom lock, and customizable switches.
Sharpness is excellent in the center and good in the corners at 12mm, with 20mm corners improving when stopped down.