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"Resolution/Sharpness: Good resolution, 1,000 lines of "strong detail." (More, with artifacts.) The S1 IS performed well on the "laboratory" resolution test chart. It started showing artifacts in the test patterns at resolutions as low as 600-650 lines per picture height, in both horizontal and vertical directions. I found "strong detail" out to at least 1,000 lines, although you could argue for as high as 1,200 horizontally. I chose to rate it at the lower 1,000 line number though, due to the level of moire artifacts that are present beyond that point. (I tend to rate cameras more conservatively than some reviewers.) "Extinction" of the target patterns occurred around 1,300 lines"
http://www.imaging-resource.com/PRODS/S1IS/canon-powershot-s1-IS-A.HTM#conclusion
"Resolution/Sharpness: Good resolution, 1,000 lines of "strong detail." (More, with artifacts.) The S1 IS performed well on the "laboratory" resolution test chart. It started showing artifacts in the test patterns at resolutions as low as 600-650 lines per picture height, in both horizontal and vertical directions. I found "strong detail" out to at least 1,000 lines, although you could argue for as high as 1,200 horizontally. I chose to rate it at the lower 1,000 line number though, due to the level of moire artifacts that are present beyond that point. (I tend to rate cameras more conservatively than some reviewers.) "Extinction" of the target patterns occurred around 1,300 lines"
http://www.imaging-resource.com/PRODS/S1IS/canon-powershot-s1-IS-A.HTM#conclusion