Full image (300mm f4)@f4
By thomas_janik
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Full image from which crops takenPentax 500mm f5.6 and 300mm f4 ED(IF) and Pentax new 2x (along with a Sigma f8 mirror for fun). All mounted on Pentax DS, Gitzo 340, 1376 head. Camera was moved to give approximately the same size image with each focal length. Crops are at full resolution of the DS. No sharpening has been applied.