Sigma sd Quattro , a compact system Review

Rear of the Sigma sd Quattro
Introduction The Sigma sd Quattro, a compact system camera with a 39-megapixel APS-C sized Foveon X3 Quattro sensor, has a unique sensor outputs [...]

Sigma’s latest “Art” lens, the 50-100mm, offers the widest aperture of any zoom lens on the market

Introduction As it is a “DC” lens, this means it has been designed to be used with crop (APS-C) cameras. This gives it an equivalent focal length of [...]