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10-25-2012, 10:44 AM   #16
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Brick walls are great for testing normal or longer lenses, but many wide angle lenses [Tamron 17-50 is one of them] have some curvature of field. This will render corners soft when the focused on the center and the center soft when focused on the corners [at the wide end and large aperture]. This is not a huge problem with most 3-D subjects, though.

10-25-2012, 11:32 AM   #17
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Reeftool's idea of shooting typical scenic subject matter seems sensible to me, and is kinda what I do. A distant tree line is good to check edge sharpness, IMHO. For longer lenses I tend to shoot things in the middle distance and look at the bokeh of the background.
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