The Helios-103 and "rebranded" Menopta 53/1.8 are based on the Zeiss Biotar Double-Gauss formula, 6 elements in 4 groups. The lens is made for the internal mount of the Contax and Kiev camera. With a slight modification, it can be used on a Nikon S-Mount Rangefinder camera. On the latter- it is an inexpensive alternative to the much more expensive Olympic and Millennium Nikkor 50/1.4 for a PLanar formula lens.
For the Nikon- simply loosen the two set screws that hold the optics module into the bayonet mount, unscrew 1/2 turn, and tighten the screws. The 0.5mm stand-off is enough to use the lens across range on the Nikon- assuming the RF calibration is correct.
Wide-Open and close-up on the Nikon S2.
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For the Nikon- simply loosen the two set screws that hold the optics module into the bayonet mount, unscrew 1/2 turn, and tighten the screws. The 0.5mm stand-off is enough to use the lens across range on the Nikon- assuming the RF calibration is correct.
Wide-Open and close-up on the Nikon S2.
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