Sony FE 400-800mm f/6.3-8 G OSS Lens vs Sony FE 600mm F4 GM OSS

The 600mm f/4 GM is the sharper, faster, better-built lens, and it is the one to buy if you shoot wildlife or sports in low light and can carry a prime. The 400-800mm G is the more versatile choice: a zoom range no other Sony lens covers, internal zoom, and about 565 g less weight, at the cost of a much slower f/6.3-8 aperture. Owners of the 600mm praise its sharpness wide open and its balance on a monopod; the 400-800mm draws praise for reach and handling but is criticized for its dim aperture at 800mm.

• Choose the Sony FE 400-800mm f/6.3-8 G if you need flexible reach from 400 to 800mm in one lens, shoot mostly in good light, and want to handhold or zoom while tracking.
• Choose the Sony FE 600mm f/4 GM if you shoot wildlife, sports or news in dim light, want the sharpest wide-open image and the fastest AF, and will work from a monopod or tripod.