RE. Auto-Topcor 20mm f/4 in excellent working condition (fully tested). COSMETIC ELEMENTS: 4/5 - Clear markings on the front ring, aperture ring, lens barrel. - Medium scratches on some parts of the barrel. - Focus rubber ring in okay condition, with some yellow discoloration around it. - Overall the lens is well preserved and shows medium use. MECHANICAL ELEMENTS: 5/5 - Aperture ring is smooth and clicky in classic RE.Auto-Topcor fashion. - Blades free of grease, no deformation and moving freely. - Focus ring is smooth and linear (no bump, no stoppage etc). OPTICAL ELEMENTS: 3.5/5 - Front and back glass elements show no fungus or haze. - Minimal dust inclusion. - Outermost parts of front element show little dents or impacts less than a 1mm in size. Inesthetic but not likely to even appear in the lens' image circle. - Visible to the naked eye (see pictures) are superficial and soft scratches on the first glass element exterior. These do not seem to cause adverse flaring or any loss of contrast (tested). Original Topcon rear and front cap included + Topcon branded leather case. FOCAL LENGTH: 20mm APERTURE: f/4 to f/22 (half-clicks) NUMBER OF BLADES: 6 OPTICAL DESIGN: 8 elements in 6 groups, single-coated MFD: 0.3m (may be reduced with the use of an helicoïd adapter) FILTER THREAD: Ø62mm + Series 9 MOUNT: Topcon/Exakta/Beseller ADAPTABILITY: full-frame mirrorless, APS-C, MFT, etc. via adapter S/N: 1350639 (1969) FLANGE DISTANCE: 44.7mm WEIGHT: ~215g CONSTRUCTION: All metal barrel, rubberized grip. Worldwide tracked delivery with FedEx.