Meyer-Optik's Oreston 50mm f/1.8 — a characterful East German M42 standard, forebear of the Pentacon 50.
The Meyer-Optik Gorlitz Oreston 50mm f/1.8 is an East German fast standard prime made in M42 mount from the mid-1960s. Produced by Meyer-Optik of Gorlitz, it was their fast normal lens and became the basis for the later, very common Pentacon auto 50mm f/1.8 after the works were combined.
This is a manual-focus M42 screw-mount lens with a 50mm focal length and a maximum aperture of f/1.8, with an automatic diaphragm. Focus and aperture are set by hand on the barrel and it is a compact all-metal standard prime. Detailed element figures are not asserted here beyond the verified focal length and aperture, in line with the accuracy standard.
As a fast standard the 50mm f/1.8 suits portraits, street and general work, with the bright aperture giving low-light capability and shallow depth of field. It renders with characterful out-of-focus areas that some copies show as a mild swirl, giving images the appealing vintage East German look that later carried into the Pentacon version.
Used copies are common and inexpensive, though slightly less so than the Pentacon-badged descendant. Inspect for haze, fungus and cleaning marks, confirm the aperture blades are clean and oil-free, a known weak point, and check the aperture-ring and focus feel. Verify the M42 mount. An M42 adapter makes it a characterful standard on mirrorless.