Industar-61 50 mm f/ 2.8 is a standart lens for reflex camera with a connecting thread m39 and m42 based on he optical scheme of Tessar. Diaphragm has 6 blades, the blackening is good, the hole in a star-form gives the specific bokeh picture. The lens produces the sharp image with a good contrast. Image defects are very small. The possibilities for macro are great. It allows to take a picture in a scale 1:2.5, upside down 1:1. Industar-61 50 specifications: Focusing range: 50 mm Diaphragm scale: 2,8—16 Quantity of aperture blades: 6 Mount: М42 Type of fading: 1 layer
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