One interesting tidbit is doing aperture testing is that most of my various lens (10-22, 17-55, (bare) 70-200/2.8ISv2, and even the 18-200) were \"as-sharp\" wide-open ... but the 55-250 (and that 70-200 *with* the 2xII TC) both lost some sharpness at the last click ... but F6.3 was about as good as F8.0.
Aug 30, 2012 at 08:29 AM
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