More megapixels, better photos: Fact or fiction?

Started Feb 7, 2008 | Discussions thread
John Sheehy Forum Pro • Posts: 21,543
Re: Well Chato ... here is a good comparison...

Jay Turberville wrote:

Also, once the sensor clearly outresolves the lens, you can drop the
use of the AA filter, improving overall sharpness a bit - which is
probably the last little bonus you get for having more pixels.
People seem to forget that putting a filter to purposely blur the
image projected by a lens is a significant compromise.

It is only a compromise in a narrow band of MTFs though. It is needed if the optics are sharp, relative to the pixel pitch, and it is irrelevant in the OOF Bokeh. I haven't worked out a proof, and don't know if this is already accepted, but it seems to me that the dispersions caused by things like AA filters, diffraction, soft optics, etc, all add in quadrature, just like noise does. Therefore, an AA filter does the most damage when the PSF is the same as that of the other optical dispersions. Of course, in some images this can be a prominent range.

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