The Rikenon (without XR) 50/2 is a later prime lens by Ricoh (Pentax K mount).
Some say that the Rikenon 50/2 and the XR Rikonon 50/2 are completely different. Ok, I have both lenses now.
The Rikenon 50/2 (on the left) and the XR Rikenon 50/2 (on the right):
The Rikenon is smaller and lighter (135g vs 210g without caps). The Rikenon is probably made of cheaper materials than the XR Rikenon (plastic vs metal?)
The apertures (of 6 blades) and their control (f/2-f/16 by 1EV step) are the same:
The lens coatings look the same.
The most important (for me) difference is the different minimum focusing distance (MFD):
The MFD of the Rikenon is about 0.6m, while the MFD of the XR Rikenon is about 0.45m.
The main question is: do the lenses produce the same images?
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