Sony’s 100-400mm GM Is Bird Photography on Easy Mode

Sony just put out a telephoto lens that has the photography world buzzing. The brand new FE 100-400mm f/4.5 GM OSS, launched alongside the A7R VI on May 13, 2026, is not just another lens update. It is a complete rethink of what a super-telephoto zoom can do for wildlife, birding, and sports shooters who refuse to carry a bazooka to a bird hide.

Sony’s Biggest Telephoto Drop in Nearly a Decade

The last time Sony shook up the telephoto zoom world was in 2017. That year, the original FE 100-400mm f/4.5-5.6 GM OSS arrived and quickly became a favorite for sports and wildlife shooters. Nine years later, the new version is not just a sequel. Sony is calling this an entirely new lens, built from scratch for a generation of photographers who want G Master optics without the back-breaking weight of a prime. It sits right between the brand’s enthusiast zoom lenses and its elite telephoto primes. Sony Electronics officially announced the FE 100-400mm F4.5 GM OSS on May 13, 2026, positioning it as the newest addition to its flagship G Master lens series for full-frame Alpha E-mount cameras. Covering the 100-400mm focal range with a constant F4.5 aperture, the lens delivers autofocus up to approximately three times faster than the previous model. The lens is expected to retail at approximately $4,299 USD, with availability beginning in early June 2026. In Europe, that works out to roughly €5,000 and £4,400 in the UK.

The Lens That Changes What 400mm Means

Here is the upgrade that changes everything for action photographers. The new model holds a constant f/4.5 aperture across the full zoom range. The old model closed down to f/5.6 at 400mm. That may sound like a minor tweak until you are tracking a bird of prey diving toward water in fading afternoon light. **A constant aperture means your exposure stays locked no matter how far you zoom in, so you stay focused on the shot instead of your settings.** The optical formula leaves nothing to chance:

• 28 elements in 20 groups, including two Super ED and three ED elements to reduce chromatic aberration, plus an XA aspheric lens and an ED XA element to suppress aberrations and reduce onion-ring artifacts in bokeh
• An 11-blade circular aperture engineered to produce the smooth, refined bokeh G Master lenses are known for
• Nano AR Coating II to reduce ghosting and flare for high-contrast results in backlit conditions
• Four XD Linear Motors ensuring quick and accurate autofocus, especially in action and wildlife photography

The lens utilizes both an internal focusing mechanism and a floating focusing system, which means consistent image quality across varying focus distances and a center of gravity that does not shift as you rack focus. At 1,840g, the FE 100-400mm f/4.5 GM OSS sits on the lighter end of the spectrum for what it offers, and the inner-zoom design keeps the lens balanced whether you are shooting handheld in run-and-gun situations or mounted on a tripod or monopod.

Pair It With the A7R VI and Things Get Serious

This lens was announced at the same event as the Sony A7R VI for a very clear reason. These two were built to work together. The A7R VI pairs an approximately 66.8 effective megapixel back-illuminated fully-stacked Exmor RS CMOS sensor with the new BIONZ XR2 engine. It shoots at up to 30 frames per second using the electronic shutter and records 14-bit RAW files during burst shooting rather than 12-bit. **For bird photographers, this combination is practically a cheat code.** The A7R VI features a 759-point hybrid autofocus system with Real-time Recognition AF+, a system that brings improved human pose estimation, better tracking, and more precise focusing when photographing really small subjects. Reviewers who tested the camera for bird photography reported impressive results. The bird detection autofocus proved super reliable, even able to pick out subjects when they only took up a small portion of the frame. The A7R VI also brings some standout features for wildlife work:

• The A7R VI has a 16-stop dynamic range, which is one stop more than the A7R V and most other professional cameras
• 8.5 stops of in-body image stabilization at the center of the frame
• A Pre-Capture mode that buffers up to one second of images before you fully press the shutter, so if a bird suddenly takes off or an animal turns, those frames you would have missed are now saved
• 759 phase-detection autofocus points covering 94 percent of the frame

For birds in flight, the A7R VI especially when paired with the new FE 100-400mm f/4.5 GM OSS, proved very capable in real-world testing.

Controls, Reach, and the Teleconverter Trick

Operability is where Sony’s G Master lenses really shine, and this one is no exception. A customizable function ring, four focus hold buttons, an AF/MF focus mode switch, Full-time DMF support, a focus range limiter, an OSS on and off switch, and an OSS Mode switch give you fine-grained control without ever needing to leave the eyepiece. The zoom ring has adjustable tension and only requires a quarter turn to go from 100 to 400mm. That is a welcome detail for anyone who has fumbled with a stiff zoom ring while a bird is mid-flight. Sony has a solution for anyone who balks at buying 95mm filters for this lens: near the mount is a drop-in filter holder which can accommodate much cheaper 40.5mm glass. Now here is where the real reach potential opens up. A comparison of what the teleconverters unlock:

With a 1.4x extender, you get a 140-560mm zoom at f/6.3, which remains extremely capable optically and focuses essentially as well as the native lens. Even with the 2x teleconverter giving you 200-800mm at f/9, the results are still very good. **That kind of versatility dramatically increases the value of an already premium lens.** Weather sealing, sealed seams, silicone rubber gaskets at the switches, and a fluorine-coated front element round out a build that is clearly purpose-built for working in less-than-ideal conditions. Here is a quick look at how the new lens stacks up against its predecessor:

Sony’s double launch of the FE 100-400mm f/4.5 GM OSS and the A7R VI in May 2026 marks a clear turning point in how seriously the brand is chasing the bird and sports photography market. For years, those genres largely belonged to photographers who had the lens libraries and the budgets to match. The constant aperture, blazing autofocus, and pairing with a 66.8MP camera that shoots 30fps without a blackout is a combination that is genuinely hard to argue with. It costs real money, and nobody should pretend otherwise. But if you have spent years chasing great wildlife shots and settling for almost, this combo might be the closest thing to a sure bet the camera world has ever offered. What do you think of the new Sony 100-400mm f/4.5 GM OSS and the A7R VI? Are you planning to pick one up? Share your thoughts in the comments below.