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Helios 77M-4 is a classic 50mm lens that was produced as the kit prime on Russian Zenit-series SLR. Its production was stopped in early 90s, but the lens has found recognition among contemporary photographers. Fixed at 50 mm, with original bokeh and sharp imaging, it will be ideal for portraits, landscapes and in some cases for macro shooting. Helios 77m-4 gives unique photos with beautiful, soft bokeh in the background. SPECIFICATIONS: Focal length: 50mm; Aperture: f1.8; Angular field of view: 40; Number of lenses and element: 6 elements in 4 groups; Filter thread: M52x0.75; Minimal focusing distance: 0.45 m; Mount: M42 + adapter for Canon EOS Note: Will not fit 650D, 5DmkIII, 100D, 700D, 70D and other latest cameras.