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For the heck of it, I tested my EF-S 17-85mm f/4.0-5.6 IS USM kit lens on a 400D with a borrowed EF 24-105mm f/4.0L IS USM lens recently. I mounted both lenses in turn on my camera, mounted on a tripod, and aimed it at a controlled indoor scene with both lenses set to 50mm focal length and...