By 20mm, the lens is almost perfectly rectilinear, measuring +0.10% pincushion. It is then pincushion all the way, with +1.47% at 28mm and +1.54% at 35mm. Traditionally, wide-angle lenses would ...
They join four other Sigma lenses available for the Canon RF mount, all of which are designed ... while the 23mm lens has a 35mm equivalent focal length. Both lenses offer popular focal lengths ...