The Sigma 17-40mm f/1.8 vs. Fujifilm's Best Primes: Closer Than You'd Think

The Sigma 17-40mm f/1.8 for Fujifilm X sits in an interesting spot. It's faster than Fujifilm's own XF 16-55mm f/2.8, covers a narrower zoom range, and costs less, and for event shooters who live in dark rooms, that aperture difference isn't trivial.

Coming to you from Dylan Goldby, this thorough video comes from someone who paid for the lens himself and spent years shooting exclusively with primes before picking it up. Goldby shoots corporate events professionally, often logging 20,000 steps a day carrying an FUJIFILM X-H2S along with the XF 18mm f/1.4, XF 23mm f/1.4, XF 33mm f/1.4, XF 56mm f/1.2, and XF 90mm f/2, which gives him a specific, practical frame of reference most reviewers don't have. He tested the lens in-store, checked the files on his laptop on the metro ride to a shoot, and ordered it before he got off the train.

Build quality is a genuine strong point here. Goldby puts the Sigma's construction above the XF 16-55mm f/2.8, a lens he owned for three years and had to replace the zoom ring grip on twice. The aperture ring clicks solidly, the zoom ring has enough resistance to stay put, and the focus ring feels well-damped for a focus-by-wire design. The lens also ships with a large locking hood that has a physical switch to keep it from coming loose in the field. At 530 g, it's not light, but Goldby notes it balances so well that most people who pick it up are surprised by how manageable it feels. The one real drawback physically is its length, as it doesn't telescope when zooming, which is actually a plus, but the fixed barrel size means it's a large object to pack and Goldby had to reorganize his bags to fit it.

Center sharpness is excellent across the entire zoom range, even wide open, and it holds up well when compared directly to Fujifilm's f/1.4 primes at matching apertures. The corners are a different story, particularly at the wide end, where the primes pull ahead clearly. Autofocus in single-shot mode is nearly invisible in operation: fast, accurate, and confident even in low light. Goldby does note occasional focus misses in continuous tracking, roughly one frame in ten to fifteen, with the lens sometimes jumping to the background. He also flags one workflow issue that's easy to overlook: the zoom ring rotates in the opposite direction from Fujifilm's own zoom lenses, which causes real problems if you're switching between the two during a job. Months in, it still catches him off guard.

The video also covers bokeh character at various focal lengths, a direct sharpness and bokeh comparison with the XF 16-55mm f/2.8, distortion, vignetting, chromatic aberration, coma, flare behavior, and a detailed look at how the lens performed on Goldby's first real event job with it, including what it changed about his post-processing workflow. Check out the video above for the full rundown from Goldby.