Sony FE SEL100400MC 100-400mm

Sony's FE 100-400mm f/4.5-5.6 is a featherweight super-telephoto with best-in-class autofocus and solid optics. At 653g, it's shockingly portable for the reach it offers. The slow aperture and poor bokeh are real trade-offs, making this a daylight wildlife and sports lens, not an all-rounder. If you need reach without the weight, this is the one to get.

Let's talk about what those numbers actually mean when you're out shooting. The autofocus is the headline here. Dual linear motors drive the focusing group directly, and in our testing it shows. The 98th percentile AF ranking means this lens focuses faster and more accurately than virtually anything else in its class. For wildlife shooters, that's the difference between getting the shot of a heron taking off and getting a blurry mess. The AF is also quiet, which matters if you're shooting video or trying not to spook skittish subjects.

The optical performance is strong too, landing in the 83rd percentile. The 14 elements in 10 groups include 2 aspherical and 2 ED elements, plus Sony's anti-reflective coating. In practice, that means good contrast and minimal chromatic aberration, even at 400mm. The stabilization is well above average, which helps offset the slow aperture somewhat. But the bokeh is where things get rough. The 9-blade diaphragm sounds nice, but the f/4.5-5.6 aperture means you're not getting much subject separation unless you're really close to your subject. Our data puts bokeh quality in the bottom 2%, which is one of the worst we've seen. If creamy backgrounds are your thing, this lens will frustrate you.

The competitive situation here is interesting because Sony doesn't have a ton of direct rivals at this exact focal length and weight. The Sigma 18-50mm f/2.8 DC DN and Tamron 17-70mm f/2.8 are both APS-C lenses with much shorter reach, so they're not really in the same conversation. The Viltrox 35mm f/1.7 is a prime, completely different beast. The Panasonic Leica 12-35mm and Nikon 18-140mm are also shorter and aimed at different systems.

What this tells you is that Sony has carved out a pretty unique niche here. The combination of full-frame coverage, 100-400mm reach, and sub-700g weight is rare. The trade-off is that you're giving up aperture speed compared to something like a 70-200mm f/2.8, and you're giving up bokeh quality compared to almost anything with a faster aperture. If you need the reach and the light weight, this is basically your only option in the Sony system. If you can live with less reach, a 70-200mm f/2.8 will give you much better low-light performance and subject separation.

Pricing is all over the map depending on where you live. In the US, you're looking at $848 to $850 based on current listings. In Canada, it's CAD 1,078. In the UK, GBP 781. In Brazil, BRL 9,080. Those numbers aren't directly comparable across currencies, but within each market, this lens sits in an interesting spot. It's not cheap, but it's also not in the stratosphere like some super-telephoto primes.

For what you get, the value proposition hinges entirely on how much you value the weight savings and autofocus speed. If you're a wildlife shooter who hikes long distances, the 653g weight is worth every penny. If you're a portrait shooter looking for background blur, you're paying a premium for capabilities you won't use. The build quality is only middle of the pack, so don't expect tank-like construction at this price.

Sony's FE 100-400mm f/4.5-5.6 GM OSS is one of those lenses that sounds like a contradiction on paper. A super-telephoto zoom that weighs just 653g? That's lighter than some standard zooms we've tested. And yet here it is, covering full-frame Sony E-mount with a reach that goes from 100mm all the way out to 400mm, and up to 800mm if you slap on a teleconverter. It's the kind of lens that makes you rethink what you can carry into the field.

This is a lens aimed squarely at wildlife and sports shooters who don't want to lug around a monopod and a gym membership. The autofocus system uses dual linear motors, and our data puts it in the 98th percentile for AF performance among all lenses of this type. That's the absolute best right now. If you're tracking birds in flight or kids playing soccer, this lens locks on and stays locked on.

But there's a catch, and it's a big one. The maximum aperture is f/4.5 at the wide end and f/5.6 at the long end. That puts it in the bottom 2% for aperture among similar lenses. In anything less than bright daylight, you'll be cranking the ISO or reaching for a tripod. The stabilization helps, sitting in the 82nd percentile, but physics is physics. This is a daylight lens, full stop.

If you shoot primarily in low light, this lens will frustrate you. The f/4.5-5.6 aperture is in the bottom 2% of all lenses in this category, and no amount of stabilization can fix a lack of light. You'd be better off with a 70-200mm f/2.8 zoom or a fast prime if you're shooting events, concerts, or indoor sports. Similarly, if bokeh and subject separation are important to you, look elsewhere. The bokeh quality here is genuinely poor, ranking in the bottom 2%. Portrait shooters should consider a fast 85mm or 135mm prime instead. And if you're into macro photography, the 0.41x magnification and 860mm minimum focus distance are underwhelming. A dedicated macro lens will serve you far better.

For wildlife and sports shooters who prioritize portability and autofocus speed, this lens is a no-brainer. The 98th percentile AF performance means you'll get shots that slower-focusing lenses miss. The 653g weight means you'll actually carry it with you instead of leaving it at home. And the weather sealing means you can shoot in conditions that would send other lenses back into the bag. If you're photographing birds, wildlife, or action sports in daylight, this is one of the best options on the market.

But if you're a portrait shooter, a low-light specialist, or someone who cares deeply about bokeh, look elsewhere. The f/4.5-5.6 aperture is a real limitation, and the bokeh quality is genuinely poor. You'd be much better served by a fast prime or a 70-200mm f/2.8 zoom. This lens is a specialist tool, and it's brilliant at what it does. Just don't expect it to be something it's not.