Review: Zeiss ZM 21mm 4.5 C-Biogon
Introduction The Zeiss ZM 21mm 4.5 C-Biogon is the widest of the three “Classic” designs in Zeiss’ ZM line up. It has long been discontinued and it wasn’t in production for a long time, so it is a bit rare and rather expensive on the used market. I always wondered how it would compare to … Continue reading Review: Zeiss ZM 21mm 4.5 C-Biogon