Sigma 135mm

What is the Sigma 135mm f/1.8 DG HSM Art? Since the inception of its premium Art range of lenses towards the end of 2012, Sigma…

Sigma SD Quattro

Andy Westlake tests Sigma’s unconventional SA-mount mirrorless camera, the sd Quattro

Is the Sigma 24-35mm f/2 DG HSM | A lens a viable alternative to the manufacturer’s wideangle primes? Michael Topham finds out