Comparison of image detail and sharpness with lenses at 300mm using Canon 20D RAW @ ISO 100 f/8. RAW images converted to 300 dpi tif with Canon Digital Photo Professional. Three exposures were taken, and the sharpest image was selected to minimize effects of autofocus variation. Cropped section converted to 72 dpi pixel image in Photoshop 7.

Image @ 300mm Canon 20D /
EF 300mm f/2.8 L @ f/8
Canon 20D/
EF 70-300mm f/4.5-5.6 DO IS @ f/8
Canon 20D /
EF 75-300mm f/4-5.6 III USM @ f/8
Canon 20D /
EF 100-400mm f/4.5-5.6 L IS USM @ f/8
Full Frame

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© 2004, William L. Castleman