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Is the AA filter on the endangered list too?
In rec.photo.digital RichA wrote:
Seems like lighter and lighter AA filters are appearing in certain cameras. The Leica has none. Could it be that this second-last barrier to resolution (the Bayer filter being the last) isn't long for the world? Leica's absence of an A filter isn't new. Where are the lighter and lighter ones appearing? And given that every camera maker is producing cameras with larger and larger pixel counts at least every other year, why is the AA filter a barrier to resolution? -- Chris Malcolm |
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Is the AA filter on the endangered list too?
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Is the AA filter on the endangered list too?
"John Sheehy" wrote: RichA wrote: On Mar 27, 5:38 am, Chris Malcolm wrote: And given that every camera maker is producing cameras with larger and larger pixel counts at least every other year, why is the AA filter a barrier to resolution? When 24 megapixels with, is like 16 megapixels without. No. 24 "with" has more resolution, but lower *contrast* near the nyquist. 16 "without" is more aliased. Apples and oranges; no simple monolithic metric. If you actually look at some test charts, and use the (rather reasonable) metric that "to resolve" must mean _to resolve accurately_, then what you see is that 16MP without an AA filter has less resolution than 16MP with an AA filter. (For the obvious reason that aliasing artifacts obscure actual detail.) -- David J. Littleboy Tokyo, Japan |
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