Tamron 17-50 2.8

civiletti · 10-25-2012, 10:44 AM

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.

ihasa · 10-25-2012, 11:32 AM

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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10-25-2012, 10:44 AM	#16
civiletti Pentaxian Join Date: Jul 2010 Location: Oregon Photos: Albums Posts: 1,435	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
ihasa Veteran Member Join Date: Jul 2009 Location: West Midlands Photos: Gallery Posts: 2,066	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.