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Old Dec 23, 2011, 8:55 PM   #3
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Join Date: Mar 2005
Location: Extreme Northeastern Vermont, USA
Posts: 4,252

Regarding the 28-300mm Sigma: I have a similar lens from Tamron which didn't look so good when I picked it up second hand. I found that the rubber cover around the front of the objective lens covers three screws with angled slots, which will allow adjustment of the focus. If yours is set up the same way, you should be able to get much sharper results from it.

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