Julian Davies wrote:
ALL digital cameras require an anti - aliasing filter, as do all analogue
cameras.
Where there is sufficient digicam budget, this will be a flat sheet of glass,
Most often, the anti - aliasing filter is a not - quite - pin - sharp lens.
I have suspected that this is the case. I explains the apparent
inconsistency between the common statements that lenses can be too sharp
for digital and the succesful use of very sharp lenses on DSLRs
This is essential because once an image is captured with aliasing, there is
NO POSSIBILITY of removing it, since it is indistinguishable from the wanted
signal,
I didn't make such a strong statement both because I don't know the math
and because I've been around long enough and know enough about the
history of science to know how often the claim "NO POSSIBILITY" has
turned out to be wrong. Certainly true today, I'm sure, simply because
nobody would be doing it with expensive hardware if a software solution
were known.
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