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So how good is 36 megapixels?
Alan Browne wrote:
On 2013.03.20 22:16 , Doug McDonald wrote: On 3/20/2013 6:34 PM, Alan Browne wrote: The pictures show CONCLUSIVELY that the lens is fully adequate to resolve adjacent pixels, and that the AA filer is NOT seriously smearing out the image enough to stop moire. If the AA smeared it enough to remove the moiré that you captured in your contrivation, then you would be just as happy with the detail of a 6 Mpix camera. Probably not even then. I never said that I wanted no moire in this absolutely utterly worst case moire test. What makes you think I did? I LIKE the camera the way it is. I just pointed out that if one tried to get it to generate moire, it will do so. Your "absurd" declaration did not, in any way, disprove what I said about lens MTF softening as desired sampling (sensor density) goes up. I thought the point was not that Doug diusputed that. I thought the point was that Doug said that with his camera and lens the point of lens MTF softening was not reached. Further, what I said above wrt to AA filters was not meant to be what you desire, just to illustrate the sort of heavy AA filter that would be required to tame the moiré in your high school lab experiment. (Another way of showing the irrelevancy of your examples if I have to make that plain to you.) The tactic of misunderstanding the point and ignoring experiments and facts that collide with one's world view is well used by fundamentalists and radicals everywhere. Doug made it clear that under normal circumstances such moire didn't happen. Of course a lens with a crappy MTF will reduce moire. But my trusty 24-105 f/4L zoom, not exactly the best L glass ever, still generates some moire. In summary, you retract what you said about my statement of lens mtf acting as a softening filter where ever increasing sensor densities are occurring. Thought so. Next time just keep your hands off the keyboard and save everyone some bandwidth. Next time you take down your own strawmen, try not to gloat so much. -Wolfgang |
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