The Sony FE 50mm F2.5 G ($599.99) could easily be overlooked as just another 50mm prime for the system. It's a popular focal length, and there are no shortage of options if you're a standard lens fan. But it sets itself apart by way of its slim size and premium construction. It's easily our favorite affordable 50mm for the Sony system, and while it costs more than twice that of the budget-friendly FE 50mm F1.8, the 50mm F2.5 G is a much better lens, and an Editors' Choice award winner.

Sony's Nifty Fifty

For many, the 50mm prime is the first lens you add to a kit to supplement a starter zoom, and every full-frame camera system worth its salt has at least a few good primes available in the focal length. For Sony system owners, that includes a number of excellent premium performers, like the Zeiss 55mm F1.8 that was introduced along with the first a7 camera, up through the FE 50mm F1.2 GM, a lens that debuted a week ahead of this writing.

You'll spend more on those lenses. At around $600, the FE 50mm F2.5 G isn't quite a budget pick, but it does a much better job as a "nifty fifty" lens than the FE 50mm F1.8, a low-cost entry that's held back by slower, louder autofocus. With the FE 50mm F2.5 G, focus is lighting fast and totally quiet.

Its G series designation reflects its fit and finish. It places the FE 50mm F2.5 in Sony's midrange series, so it incorporates dust and splash protection, an aperture control ring, and a function button. It's much closer to the Sigma 45mm F2.8 DG DN Contemporary in concept.

Aluminum Barrel

Like the Sigma 45mm, the Sony FE 50mm F2.5 G is a small lens, one that can rest comfortably in the palm of your hand. Sony's lens is just a smidge smaller than the Sigma, at 1.8 by 2.7 inches (HW), light at 6.1 ounces, and with support for 49mm front filters. Its barrel design is identical to the FE 24mm F2.8 G and FE 40mm F2.5 G, launched at the same time.

Despite the slim size, Sony's designers have managed to squeeze an aperture control ring, function button, and focus control switch onto the surface. Doing so places the manual focus control right on top of the aperture ring. It's very easy to nudge the focus ring when setting the f-stop. It's an annoyance, but one that only comes into play when you turn off autofocus.

The aperture ring can be set to turn with detents to click and lock at third-stop increments, or for smooth, silent operation for video. Videographers will also enjoy linear manual focus response and knurled controls that can pair with geared focus systems for manual control.

Autofocus response is quiet if you want to go that route, but regardless of method you'll notice some focus breathing when making changes. This isn't a concern for photography, but the blooming frame size makes video focus racks more distracting than effective. It's one area where the Sigma 45mm F2.8 does a better job—it shows almost no breathing, but doesn't offer silent aperture control.

Sony has a leg up when it comes to weather protection. The FE 50mm F2.5 G enjoys the full dust and splash protection treatment, while Sigma only protects its Contemporary lens series at the mount. The front element is very small and Sony has skipped the anti-smudge fluorine coat for this lens, but if you use the included hood you're unlikely to fingerprint it, and the hood should also help to keep rain drops off the glass.

The FE 50mm F2.5 G isn't a macro lens, but it does focus pretty close. It locks on as close as 13.8 inches, good enough for about 1:5.6 life-size reproduction. If you switch to manual focus you can get a bit closer (12.2 inches) for 1:5 magnification.

If you like to lean in and get close for shots, the FE 40mm F2.5 G may be a better fit as a general-purpose lens—it focuses a little closer and, despite being a wider angle lens, nets higher magnification at its minimum working distance. If you're more interested in macro work, think about the FE 50mm F2.8 Macro—it isn't nearly as small, but it's priced $100 lower and supports 1:2 focus.

Optical stabilization isn't included, but most full-frame Sony owners won't notice, as the feature is included in its cameras. With the a7R IV, I netted crisp handheld exposures at speeds as long as 1/5-second.

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If you use an APS-C model without stabilization, the FE 50mm F2.5 G is still an appealing choice if you're eyeing a full-frame upgrade or are searching for a weather-protected lens. The E 50mm F1.8 OSS is there if you prefer stabilization, but it doesn't capture an image big enough to cover a full-frame sensor.

In the Lab

I paired the FE 50mm F2.5 G with the 60MP a7R IV, Sony's highest-resolution camera, and Imatest software for technical evaluation.

The pair puts up strong results in the lab, netting excellent resolution at f/2.5 (4,650 lines) and getting steadily better as your narrow the aperture. At f/5.6, it nets outstanding resolution with the a7R IV (5,060 lines), close to as high a figure as you can expect from its sensor. Clarity is strong right up to the edges of the frame, too.

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You can set the f-stop narrower. The lens captures photos with excellent resolution through f/11, but details appear a little softer at f/16 (3,880 lines) and f/22 (2,500 lines). You still may want to use f/22 to net landscape shots with sunstars, though don't expect points as sharply defined as with a wider lens.

The focal length, along with the 7-blade rounded aperture, make the lens better suited for shots with smooth, defocused backgrounds. Defocused highlights are perfectly round toward the center of the frame, but do give way to a cat's eye effect at the edges when using the lens at f/2.5. Stopping down to f/4 gives the edges a more pleasing, circular look.

The lens works in conjunction with some in-camera corrections as well. The a7R IV automatically applies distortion correction, so there's no pincushion or barrel effect in the results, and also compensates for a vignette. With corrections turned off you'll notice some dimness at the edges of the frame. If you leave them enabled, expect a very slight vignette at f/2.5 only.

The Niftiest, If Not Thriftiest

It's not a stretch to say that the FE 50mm F2.5 G is among our favorite 50mm lenses for the Sony system. We love its small, light build, aluminum construction, and optical performance. Weather protection, speedy autofocus, and quiet operation only serve to add to its appeal.

There are some downsides to consider. We're happy to see Sony include a control button on the barrel, but less so with how cramped all the controls feel—the aperture and manual focus rings are practically on top of each other. And for video work, focus breathing is a real concern.

If you're willing to spend more, Sony has a few lenses positioned higher in pricing. The Zeiss 55mm F1.8 ZA is an older lens with a slightly bigger form, priced around $900. There's also the excellent Zeiss 50mm F1.4 ZA for around $1,500 and the FE 50mm F1.2 GM for $2,000.

The FE 50mm F2.5 G costs less, around $600, but that's still a bit steep to be called budget-friendly. If you want to spend less, the Sigma 45mm F2.8 DG DN Contemporary is priced $50 lower and is sometimes offered at discount. It's very close in focal length and design language, and an excellent performer in its own right—it earned an Editors' Choice award when we reviewed it in 2019. Budget shoppers can also look to the Rokinon 45mm F1.8, available for under $400.

You get a little bit more with the FE 50mm F2.5 G. Its optics are sharper on the highest-resolution sensors, and it offers silent aperture control and more robust dust and splash protection. It's one of our favorite lenses for the system, and an Editors' Choice winner.