Tamron Tamron Di III Tamron 17-70mm f/2.8 Di III-A VC RXD Lens for Review

Tamron's 17-70mm f/2.8 is a big deal for APS-C shooters. It's the first lens to offer a constant f/2.8 aperture across a 17-70mm range, which gives you a super useful 4.1x zoom in a single package.

That range is the main story here. You get a wide 17mm for landscapes or tight rooms, and it zooms all the way to a 70mm short telephoto. It's basically a do-it-all lens you can leave on your camera.

Its versatility is off the charts, ranking in the 94th percentile. That's its killer feature. The constant f/2.8 aperture is solid for low light and background blur. But the optical performance and autofocus are just average, landing around the 30th-50th percentiles. Don't expect tack-sharp perfection across the frame, and forget about close-up macro work—it scores terribly there.

At $799, it's not cheap. You're paying a premium for that unique focal range with a constant aperture. If you absolutely need one lens that goes from wide to telephoto and you shoot in variable light, the price might be justified. If you don't need that specific range, there are sharper primes for less money.

This lens is in a weird spot. It's competing against prime lenses like the Viltrox 35mm f/1.7 or Sony 15mm f/1.4 G, which will be sharper and faster but lock you into one focal length. Compared to a standard kit zoom, it's way better in low light. But if you want a sharp, stabilized zoom for video, you might look at something like a Sigma 18-50mm f/2.8, which is smaller and often sharper, though it doesn't zoom as far.

Buy this if you're an APS-C shooter who values convenience above all else and needs one lens to cover a huge range. It's perfect for travel, events, or as a reliable walk-around lens. Skip it if you're a pixel-peeper who demands the ultimate sharpness, need in-lens stabilization for video, or want to do any macro photography.