The zeiss 35mm f28 t c biogon zm silver lens is a compact wide angle lens with a moderate focal length and is the perfect addition to your light mobile camera equipment the c in the title indicates a rather unusual feature for a lens at this performance class its speed of 1 28 allows for an exceptionally compact construction with a focal length of 35 mm this biogon lens is designed for multiple uses whether you are traveling through impressive landscapes or visiting cities compilin