Professional super-telephoto prime lens for Sony full-frame mirrorless cameras.
The Sony FE 400mm f/2.8 GM OSS is Sony's professional super-telephoto prime for the full-frame E-mount system, part of the G Master (GM) tier representing Sony's highest optical and mechanical specifications. GM = G Master optical excellence; OSS = Optical SteadyShot stabilisation. Designed for professional sports, wildlife, and nature photography.
400mm focal length, f/2.8 maximum aperture, G Master (GM) optical quality, OSS (in-lens optical stabilisation), Nano AR Coating II, XD (extreme dynamic) linear AF motors, Sony FE full-frame mount, fluorine front element, approximately 2895g.
The Sony FE 400mm f/2.8 GM OSS delivers reference-class performance for professional sports and wildlife photography on Sony's full-frame mirrorless platform. The XD linear AF motors provide extremely fast, accurate AF tracking. In-lens OSS supplements Sony's in-body stabilisation for combined stabilisation on compatible bodies. Compatible with Sony's FE 1.4× and 2× teleconverters.
Test AF tracking speed and accuracy on moving subjects. Check OSS function. Inspect front element fluorine coating for any damage. Confirm Sony FE mount contacts are clean. Test teleconverter compatibility if relevant. At this price tier, service history and provenance are critical.