Firmware update improves AF performance of Sigma 100-400mm F5-6.3 DG OS HSM lens for Canon

Firmware update improves AF performance of Sigma 100-400mm F5-6.3 DG OS HSM lens for Canon
Sigma has released new firmware for its …
Source: dpreview
Firmware update improves AF performance of Sigma 100-400mm F5-6.3 DG OS HSM lens for Canon