Rare Vintage MIR 20mm F/3.5 M42 Ultra Wide Angle Manual Focus Prim Lens / USSR. Extra wide-angle lens with coated optics for SLR cameras with M42 thread. Mir-20 was created on the basis of the Flektogon 2.8 / 20 lens (Carl Zeiss Jena). Focal length: 20 mm Field of view: 96° Frame size: 24×36 mm […]