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Old 03/24/2011, 02:01 PM   #42
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Join Date: May 2002
Posts: 32,908
I believe that's internal focus. When you look at the specs on the Sigma 105 they mention dimensions and extended dimensions. The 150 only lists one dimension.


[I]Dodging and burning are steps to take care of mistakes God made when establishing tonal relationships. ~ Ansel Adams[/I]
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