Sigma’s latest optic claims the title of being the first full-frame zoom lens to offer an aperture of f/2, but is it a viable alternative to the manufacturer’s wideangle primes? Michael Topham finds out
Sigma 24-35mm f/2 DG HSM | A Review – Test Results
Our new graphs from our Applied Imaging tests show the lens produces impressive sharpness at the wide end of the zoom when it’s set to f/2. You can expect a drop-off in sharpness at the edges, but closing it down to f/2.8 and f/4 sees sharpness in the corners improve. There’s a slight drop of in sharpness at 30mm and to achieve optimum sharpness from the centre to the edge, you’ll want to shoot between f/5.6-f/8.
Shooting wide open at the maximum aperture (f/2) creates strong vignetting in the corners. Stopping the lens down to f/4 sees the affect of vignetting reduce significantly and things only get better when you set the lens to f/5.6 and beyond. While the vignetting won’t be to everyone’s taste, it can be used effectively to draw viewer’s eyes to a central subject in the frame.
Our test charts reveal moderate levels of barrel distortion at 24mm, with straight lines towards the edge of the frame bowing outwards. This isn’t unusual for a wideangle lens and isn’t anything we expect the forthcoming lens profile won’t be able to correct for. There were also signs of pincushion distortion at 35mm.