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Old Jun 8, 2007, 2:59 PM   #11
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Mark1616 wrote:
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Not sure how specifically I would tell if you had a bad lens without having one known to be good next to it, however one of the Sigma 17-70's I had was not focusing correctly which is quite easily noticeableand if you are not getting sharp results at a good shutter speed and say f5.6 there is something wrong too. The more lenses you shoot with the easier it becomes to tell if there is a problem.
My 17-70 has none of those problems, but i was also thinking of buying the Tamron 17-50, but have heard stories of it was to soft bla bla bla...
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Old Jun 8, 2007, 3:05 PM   #12
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yohy wrote:
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A good copy of what? Do you mean that some lenses of brand Xare not really manufactured by company x? (e.g., a "Sigma" lens might be manufactured illegally and not actually be from Sigma, the company?)
No the manufacturers do make the lenses, but sometimes it's a dud i guess, i don't know my 17-70 say's made in Japan, so maybe some that are made in China are bad copies.
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Old Jun 8, 2007, 3:27 PM   #13
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Mark1616 wrote:
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Not sure how specifically I would tell if you had a bad lens without having one known to be good next to it, however one of the Sigma 17-70's I had was not focusing correctly which is quite easily noticeableand if you are not getting sharp results at a good shutter speed and say f5.6 there is something wrong too. The more lenses you shoot with the easier it becomes to tell if there is a problem.
Oh -- I see. A "lemon," so to speak. I hadn't even thought of that.
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