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| Re: Your choice of body for wildlife? |
Here is a comparison of image quality under "Equivalence" (Same subject distance, same framing, same DOF, same shutter speed) between the Pentax Q small sensor, and approximately 25.6 x 19.2 mm out of the 5DII sensor (it is cropped a bit more on the long side to get a 4:3 aspect ratio). The crop factor between the two utilized sensor areas (and pixel pitches) is 4.16.
Setup 1: Pentax Q with EF 135 mm 2.0 L. ISO 125. 1/50 sec.
Setup 2: Canon 5DII with EF 400 mm 5.6 L + 1.4X TC III. ISO 2000. 1/50 sec.
Unfortunately the ducks didn't want to pose anymore, and it started raining. So this is wildlife of another kind.
As expected, the larger sensor is clearly better. Or more correctly, the lens resolving power is the limiting factor. However, at web sizes, with some processing, the small sensor can still produce a good quality image.
Pentax Q 135 mm F/2 full image
5DII 560 mm F/8 near full image
Pentax Q 135 mm F/2 full image with strong local and slight global contrast enhancement
5DII 560 mm F/8 100% crop
Pentax Q 135 mm F/2 100% crop