From DXOMark: More pixels offsets noise3

Started May 30, 2009 | Discussions thread
bobn2
bobn2 Forum Pro • Posts: 61,149
Re: Bob..

Kuivaamo wrote:

bobn2 wrote:

In practice, the 'limit' would be set at a higher
contrast than zero, and we might exclude some esoteric and excellent
lenses, but when the sampling frequency is above the maximum
physically possible resolution of any lens, there is no point having
an AA filter.

If this approach is eventually taken, let's hope Canon won't release
a diffraction-limited 50/1.2; by my quick and dirty estimate we'd
need a 950 megapixel APS-C sensor to avoid aliasing without an AA
filter.

True. Thats why I excluded esoteric and excellent lenses. Generally lenses are aberration limited at wide apertures, and so far as I know, none even approaches the theoretical diffraction limit at f/4 or so. At that point, aberrations are your friend. I would have thought 500 pixels/mm (216MP on FF) would be enough to see pretty much every lens below 10% contrast over its whole aperture range, and that's within the range of current P&S pixels. Could be wrong, though.

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Bob

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tko
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