This is an underrated 50mm lens with Pentax K mount:
The XR Rikenon 1:2 50mm lens.
Note that this is the pure XR Rikenon version without extra letter (L, S, P). This is one of the standard 50/55mm lenses for Ricoh film SLR SLRs in the late 1970s and early 1980s:
(Ricoh KR-10 specifications)
(Ricoh XR-1s specifications)
The lens is believed to have been made by Tomioka and is sometimes called the "Poor-man's Summicron" (referring to a Leica Summicron 50/2 lens). Other sources claim that the lens was made by Cosina.
The optical design is 6 elements in 5 groups (Ultron-like):
The aperture has 6 blades:
The aperture ring has click stops at f/2, f/2.8, f/4, f/5,6, f/8, f/11, f/16.
The filter thread is 52x0.75mm.
The minimum focusing distance is about 0.45m. This is a special feature of this XR version, other Rikenon 50/2 versions have a longer focusing distance.
Often people don't like 50/2 lenses, preferring faster (f/1.8-1.4) lenses. But the overall image rendering of a 50/2 lens can be more interesting than a faster aperture.
See also related notes:
- XR Rikenon 50/2 vs Rikenon 50/2 (2025-03-27)
- Rikenon 50/2 (K): Cheaper version of XR Rikenon 50/2 (2025-03-23)
- XR Rikenon 50/2: Samples [1] - FF - f/2 (2024-10-04)
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