Sony Released New Firmware Updates for FE 70-200mm GM & 100-400 GM Lenses
Sony released the new firmware updates for FE 70-200mm f/2.8 GM OSS lens and FE 100-400mm f/4.5-5.6 GM OSS lens to improve AF-C (continuous AF) performance for zooming when attached to the Sony a9 camera.
Note: The lens must be attached to an E-mount body camera to perform this update. The NEX-5, NEX-3, NEX-C3, NEX-VG10, and PXW-FS7 model cameras cannot be used.
Read more: Best Sony Full Frame E Mount Lenses.