Our IRON GLASS Cine MIR-20M 20mm F3.5 PL is an old Sowjet Lens rehoused by IRON GLASS. It features a metallic 0.8 gear for focus and aperture. Very well suitable for full frame format. See here what IRON GLASS writes about this lens: MIR- 20M 20mm F3.5 is the widest rectilinear lens in Soviet lens line-up. It’s losely based on the Carl Zeiss Flektogon 20mm optical formula. The minimum focusing distance is just 0.18m, which makes it one of the shortest close focusing lenses in its class and a great lens for getting very close to your subject. If you want the maximum depth of field though, focusing to around 2m brings pretty much everything into focus!