This is the F1.7 version, a brighter, higher-end model than the RIKENON 50/F2, which is often compared to the Japanese Summicron. It's a rare lens, with fewer units produced than the F2 version. Stored in a dry cabinet, it's in beautiful condition with no noticeable scratches on the exterior or optics. The optics are free of mold and haze, with only minor dust. Please check the photos. It features sharp rendering from the open aperture and a distinctive bokeh, making it ideal for those who want to try a prime lens or for old lens collectors. *Please purchase only if you understand that this is an old product. Due to measures to prevent swapping, please understand that sales are non-refundable and non-returnable (NC, NR). #PrimeLens #Kmount #OldLens #Pentax #PENTAX #RICOH #RIKENON #Summicron