From the Canon reveiw:
"Would you ever consider removing the anti alias (low pass) filter -
or using a lighter one - on high end, high resolution models such as
the EOS 1Ds Mark III, to improve pixel level sharpness, removing any
moiré in software (like medium format cameras)?"
It's impossible, after the fact, to distinguish real detail from high frequency
detail that is mirrored down below Nyquist. It's a many-to-one transform.
Running it backwards isn't well-defined. So software can never do what
an AA filter does, or undo the effect of lacking an AA filter.
I think particularly for high end models, with photographers doing critical
work, it's important to have real detail rather than false detail, giving an
impression of sharpness.
"Pixel sharpness" is not a good goal to aim towards. It's better to have enough
Mp to go via a few pixels when going from black to white.
It's no coincidence that all manufacturers, except for a few ones with tiny
market shares, trying desperately to offer something different, are using AA
filters.
Ironically, what's needed to be able to remove the AA filter without ill effects
is an increase in megapixels, massively so for DSLRs, something that DPR have
a mental block against.
Actually I've rarely seen DPR's misconceptions so clearly exposed as in that
Canon review (also in some other questions).
Just my two oere
Erik from Sweden
The image screams, "I am a bunch of fragments of reality chosen to be included here by chance alignments" -John Sheehy, about lack of AA filter