The FE 400mm f2.8 GM OSS is the first super-telephoto for Sony's full-frame Alpha mirrorless system and finally allows them to pitch it as a serious rival to Canon and Nikon for pro sports and wildlife photographers.

The remarkable light weight and excellent balance of the FE 400mm F2.8 GM OSS lens - weighing it at only 6.38 lbs. - is achieved through an innovative optical design that includes three fluorite elements as well as the liberal usage of durable magnesium alloy components.

The lens is exceptional. I use it mainly for wildlife. And being it is super-fast with lock-on and tracking when used with the A9, its excellent for birds-in-flight. The 1.4x and 2x extenders are also the best Ive used.

Sony's Alpha A9 is a brilliant camera for shooting action , thanks to its incredibly quick AF system and 20fps burst shooting. However, it's been hampered a little by the limited selection of Sony telephoto lenses, with the FE 100-400mm f/4.5-5.6 GM OSS the longest dedicated optic for Sony's range...

Lightweight for a 400mm f/2.8; Very fast focusing speeds; Backgrounds nicely defocused; Customizable ring

Not cheap; You'll still need to use a monopod

I've owned a few big tele's ... This is by far the best, quick, accurate, super sharp and easy to hand hold - way, way better than anything I've ever used before !!!

Took this lens on safari in Sabi Sands, South Africa and it loved up to all of my expectations. Light, fast, sharp.

Sony's FE 400mm F2.8 GM OSS ($11,999.99) was the company's first high-end lens for its mirrorless system back in 2018. Its focal length is ideal for bringing distant action closer into view and the lens focuses fast enough to keep pace with world-class athletes, skittish wildlife, and other subjects in motion. It's as good a performer as you'd expect for the price, and its magnesium alloy barrel should outlive most digital cameras. This is a lens for the most demanding photographers, especially those capturing action with Sony a1 and a9 II cameras.Sony's Big White Lens The FE 400mm F2.8 GM OSS is hefty, but that's the case with any telephoto prime that has such a tight angle of view. At 14.1 by 6.2 inches (HD), it looms large over any full-frame camera you attach. The lens is heavy too, weighing in around 6.4 pounds. Add an a1 and you're carrying about eight pounds. The size and weight are not out of line, though; the Canon RF 400mm F2.8 L IS USM for the EOS R mirrorless system is...

The Sony FE 400mm F2.8 GM OSS is everything a high-end telephoto lens should be—sharp, quick to focus, and with a bright aperture for use in tough light. Of course, like any other lens in its class, it doesn't come cheap.

Super telephoto angle of view; Bright F2.8 aperture; Sublime optics; Balances well for handheld and monopod use; All-weather, magnesium alloy construction; Supports teleconverters; Full-speed capture with Sony's a1 and a9 series

Prohibitively expensive for enthusiasts; Stabilization only nets about three stops; Tripod foot isn't Arca compatible