50 millimeter focal length and maximum aperture of f/1.8 Great for portraits ... stills 80 millimetre effective focal length on APS C cameras, 50 millimetre on full frame cameras.
In recent years, Sigma has been creating some optically outstanding lenses for mirrorless cameras at a more affordable price ...
So, we will be seeing the Sigma 16mm f/1.4 (an effective 25.6mm lens ... with the company filling the gap of "expert" optics for Canon's APS-C cameras. "The welcome was very positive.