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yes there are two incarnations of the nifty fifty, Mk 1 and Mk 2, the Mk 2 is the more commonly seen one, and is a good lens for daytime photography, although it does suffer a bit of coma, the Mk 1 was the original one that got the lens its reputation..
Other differences include the fact that the Mk1 was metal mounted, where as the Mk2 is plastic mount, (the mk2 is often referred to as "plastic fantastic")
I had a mk1 back before I got into astronomy and astro photography, and im now constantly scanning the forums/ebay for a 2nd hand Mk1.. as the Mk2 whilst it is a good lens, is not quite to the standard of the Mk1
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