flyfishertoo Offline Upload & Sell: Off
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melcat wrote:
It's the wrong thing to do because the 7D has twice as many pixels and therefore the image on screen viewed at 100% is stretched 1.4× along any given line. This means any lens aberration, poor technique, diffraction, atmospheric haze, wobbly tripod etc. is multiplied 1.4× on the 7D.
The correct method is to upres the 40D image to the same size as the 7D one and compare that to the 7D image. Alternatively, if the 40D's resolution is sufficient for your uses, downres the 7D image and verify it's at least as good as the one from the 40D.
Also make sure both images have the same amount of sharpening (most usefully, none). I've seen some arbitrary defaults in raw processors, so check the actual values in the panel rather than using the defaults for comparison.
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I think that I understand what you are saying, not I'm not 100% certain. So do I not want to want to view at any enlarged detail, or do I want to stop at 50%? In all the years since I have been using RAW, I was always under the impression that to sharpen, I needed to view at 100%. Not true, or no longer true.
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