Sony's 400mm and 600mm Primes Undercut Nikon on Price and Weight

Sony's FE 600mm f/6.3 GM OSS weighs almost 400 grams less than Nikon's NIKKOR Z 600mm f/6.3 VR S and costs roughly $1,500 less — the sharpest edge in a four-lens comparison that professional bird photographer Jan Wegener, shooting birds for more than 20 years, has now put numbers on. For working wildlife photographers, long glass is typically the single largest line item in a kit, so a four-figure gap and a few hundred grams carry real consequences for what ends up in the bag for years.

What do the numbers say?

Wegener's side-by-side of the 400mm pair — the Sony FE 400mm f/4.5 GM OSS against the Nikon NIKKOR Z 400mm f/4.5 VR S — finds the Sony about 170 g lighter and roughly $800 cheaper. Both lenses focus down to 2.5 m (8.2 ft), both deliver excellent results wide open at f/6.3 with a 1.4x teleconverter, and both produce very good images with a 2x converter at f/9. Wegener sees no meaningful image-quality difference between them. The Sony is a little lighter; the Nikon a little shorter. On the 400mm lenses, the choice is close to a coin flip.

The 600mm pair is not. The Sony matches the 400mm lenses' 2.5 m minimum focus distance; the Nikon needs 4 m (13.1 ft). That difference makes it harder to fill the frame with a small songbird on the Nikon.

Where Nikon holds the advantage

Hand-holding the Nikon lenses, Wegener reports the viewfinder image looks nearly as steady as it would on a tripod, which makes framing and following a small bird easier. He says he can start filming hand-held video at almost any moment with either Nikon lens — even with a teleconverter attached — and get footage that is essentially shake-free. The Sony setup gives a less settled view, and smooth hand-held video takes more work.

He attributes this to how each system pairs in-body stabilization with the lens' own stabilization, not to the lenses alone, and notes Sony's active stabilization modes help at the cost of an extra crop. For stills at slow shutter speeds, the gap shrinks considerably. Video-heavy shooters should weigh this point more heavily than stills-only shooters.

Wegener also points out that the Nikon 600mm PF is already easier to hand-hold than popular zooms like the Sony FE 200-600mm f/5.6-6.3 G OSS or the Nikon NIKKOR Z 180-600mm f/5.6-6.3 VR — a point that matters most for photographers who travel constantly or carry a lens all day.

Why f/6.3 primes exist at all

A decade ago, 600mm of reach in a prime meant an f/4 lens weighing over 3 kg, a five-figure price, and usually a monopod or gimbal. Canon's RF 600mm f/11 IS STM in 2020 and Nikon's 400mm f/4.5 after it demonstrated how many photographers would trade some light for a lens they could carry all day. Nikon's 600mm f/6.3 PF followed, using a phase Fresnel element to shorten the barrel; Sony competes in the same space with a more conventional optical design.

Better high-ISO sensors and tools like Lightroom's Denoise, which arrived in 2023, make that trade easier to accept: an f/6.3 lens shot at ISO 3,200 cleans up far better now than it would have a few years ago. In practice, a hand-holdable prime changes workflow — following a bird along a creek, shooting from a kayak, pivoting quickly when something flies past, all awkward with a tripod-bound 600mm f/4.

What about the bodies and the total bill?

Wegener argues the camera bodies may separate these systems more than the lenses do. Sony holds an edge in speed and tracking consistency, with raw pre-capture and 30 frames per second on bodies like the a1 II, versus 20 fps raw on the Nikon Z9. Nikon's subject detection, meanwhile, has become very good at finding small birds in a busy frame and can match or beat Sony there.

Pricing gets complicated. At list prices, the Sony combination comes out cheaper in five of six body-and-lens pairings, but Nikon's current camera discounts flip a lot of those numbers. What does this change for buyers? Video-first wildlife shooters get a clear answer in Nikon's stabilization; anyone prioritizing reach at close distances, burst rate and list-price value leans Sony — and Wegener's final system pick appears in the video accompanying his comparison.