The two lenses have a lot in common, including using a lightweight construction. The 400mm weighs 994 g (2.2 lbs), with the 600mm coming in at only a single gram more. For comparison, Nikon’s 400mm F4.5 and 600mm F6.3 are both over 1000g. They are also especially light compared to Sony’s faster 400mm and 600mm lenses.

Each lens uses two of Sony’s linear motors, with one for each focus group. Sony says both lenses provide fast and precise autofocus, with the ability to maintain focus tracking at up to 120 fps or during 4K 120p recording.

The 400mm F4.5 and 600mm F6.3 are each compatible with teleconverters, providing even more reach when needed. They both feature an 11-blade aperture diaphragm and are compatible with 95mm filters.

The on-lens controls are consistent between each lens, too. They feature 4 focus hold buttons around the barrel and a customizable function ring. There’s a focus range limiter (full range and infinity to 7m) and full-time manual focus override. A switch enables three different stabilization modes: one for normal camera shake, one for panning and one designed to keep the viewfinder image more stable while tracking fast, erratically moving subjects.

The lenses are dust and moisture-resistant, with sealed seams and silicone rubber gaskets around the switches and buttons, plus a sealed lens mount ring. The front elements feature a fluorine coating to repel oil and water. The lenses include a removable tripod foot.

Sony

The main physical difference between the 400mm and 600mm, besides focal length and aperture range, is the optical design. The 400mm features 22 elements in 16 groups, while the 600mm comprises 24 elements in 17 groups. However, both utilize 3 Super ED elements and 1 ED element.

Both lenses also feature a design with only a single front lens element. Sony says this helps keep the overall weight down, and also shifts the weight towards the camera body for better balance when holding the setup and smoother panning. Naturally, Sony promises superb sharpness from both.

There’s also a $1000 price difference between the two. The FE 400mm F4.5 GM OSS is listed at $2699, while the FE 600mm F6.3 GM OSS is $3699. They are available for pre-order as of today, with initial orders expected to begin shipping October 8.

Sample galleries

We expect one of the most common applications for both new lenses to be wildlife photography, so we’ve primarily built our sample galleries around this use case. Most of the photos you see in these galleries were shot at Ninepipe National Wildlife Refuge in Montana, the Confederated Salish and Kootenai Tribes Bison Range in Montana, and at the Oregon Zoo.

Please do not reproduce any of these images on a website or any newsletter/magazine without prior permission (see our copyright page). We make the originals available for private users to download to their own machines for personal examination or printing; we do so in good faith, so please don’t abuse it.