4 hours ago
5
Most full frame zooms start at 24mm, but this one opens at 20mm and weighs less than a pound. That extra width changes what a single travel lens can cover, and it forces a real decision about reach.
The lens under review is the Sigma 20-60mm f/2.8-4 DG, and Christopher Frost tests it on a Sony a7C R with a 61-megapixel sensor. It sells for £749 in the UK or $849 in the US and comes in Sony E-mount and L-mount versions. Frost points out the obvious tradeoff right away: this lens tops out at 60mm, while most rivals reach 70mm. You can crop into a 60mm frame if you need a little more reach, but you can never crop your way back to a wider angle. The 20mm end is the payoff, and it opens up landscapes, interiors, and vlogging that a 24mm start can't quite match.
Build quality holds up well for the weight. The main barrel is plastic, but at 375 g, it feels solid and tightly assembled, with a metal mount and a weather-sealing gasket. There's no autofocus switch, though the focus motor is fast, accurate, and quiet in both single and continuous modes. Frost notes minimal focus breathing at the telephoto end and more of it as you zoom wide, which mostly concerns video shooters framing tight. The zoom ring turns with a slightly heavy, smooth action that suits slow zooms on video, and the filter thread is 67mm. There's no image stabilization, so lean on your camera's in-body system if you have one.
Image quality on that demanding 61-megapixel sensor lands better than the compact size suggests. At 20mm and f/2.8, the center is very sharp with excellent contrast, and even the corners show real detail despite some darkening wide open. At 35mm, Frost spotted a touch of optical decentering, with the right side noticeably softer than the left, though stopping down to f/5.6 and f/8 cleaned it up across the frame. At 60mm, the center is good rather than biting sharp, so closing down a stop earns a small but visible gain. Distortion and vignetting are heavy at both extremes with corrections off, which means keeping in-camera profiles on or fixing raw files by hand.
Wide-angle zooms like this reflect a broader shift in how people build a kit. The old logic said buy a fast standard zoom and add a wide prime later. Sigma is betting that a single lens starting at 20mm covers enough ground that many shooters never bother with the second bag. That logic fits anyone doing a mix of travel, video, and everyday shooting who values a lens that disappears into a bag over one that maxes out resolution. The wider you shoot, the more the corners matter, and a lens this small delivering usable 20mm corners is exactly what makes the compromise on reach worth accepting. If your work leans toward portraits or wildlife, the 60mm ceiling will feel short, and a 24-70mm serves you better. Match the lens to how you actually shoot rather than to the spec sheet.
Close-up performance turned out to be a genuine strength, something Sigma promoted directly. At 60mm the lens gets you close, with lower contrast and some purple fringing at the edges wide open, though f/5.6 and f/8 tighten things up nicely. Zoomed wide, close-up shots look sharp even from f/2.8, which opens up creative options for small subjects. Flare stays under control, sunstars appear from f/11 and grow strong by f/22, and coma is minor at f/2.8 and gone by f/4. The bokeh is the softer point here, occasionally busy and a little heavy in the background, and longitudinal chromatic aberration runs strong at f/4 before fading around f/11.
See Frost's full test footage and side-by-side comparisons in the video above.
English (US) ·