I had this lens from my Russian Zenit, German Pentacon and Pentax Spotmatic M42 thread mount era, but sold it after I bought the Sigma 10-20 EX DC f4-5.6 for my Pentax K20D. The old Pentax is no match for the newer Sigma UWA, except that I have to contend with f5.6 at the 20mm end. My God the Sigma is awesome - brutally sharp at the 20mm end. I wish I had the money to buy the Tokina UWA which is much much superior to the Sigma. I am sorry folks, about these ancient lenses - I have half a dozen myself - apart from nostalgic value, they cannot beat modern "plasticky" lenses in performance - most of them. I say this, as I also have a Leica SLR with Leica lenses - circa 1995 - best lying around in my cupboard - antique value only. Bipin - from a far away enchanting land.
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