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09-15-2012, 08:29 AM   #16
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QuoteOriginally posted by jt_cph_dk Quote
Im sure that your lens is faulty somehow...
QuoteOriginally posted by gofour3 Quote
Yeah I would try another copy, mine is very sharp and does not have that issue...
My thoughts as well. These things happen. I have had a couple of lenses that should have been great, but suffered from the kinds of issues you report. In one case the issue was fungus and apparent internal film. In another, the inner elements had been scoured in an apparent attempt to remove fungus. In another, the rear element appeared to have been subjected to buffing with steel wool!


Steve

09-15-2012, 11:08 AM   #17
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I too would encourage you to try another copy of that lens. I did a side by side comparison test--similar to yours--between my K55 and my A50 1.7. My results showed nearly identical performance between the two, with the K55 having slightly more edge sharpness at f8.

Also, I would strongly recommend, if you are serious about getting the best performance possible out of your lenses, to *always* use a lens hood.
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