Viltrox AF 75mm f/1.2 PRO XF: B&H Photo / Amazon / Adorama Viltrox released beta firmware for the Viltrox AF 75mm f/1.2 PRO XF that improves AF speed among other things. You can download Beta Firmware 1.01 here, and if you have difficulties, Firmware 1.00 can be found here. 1. Increase AF focusing speed 2. Optimize the stability of AF … Continue reading Viltrox AF 75mm f/1.2 PRO XF Beta Firmware 1.01 Released