On 09/10/2013 1:00 PM, Postmaster wrote:
Larry Colen wrote:
It seems to me that if you had a rear illuminated sensor, with no space
between the pixels, and it had no bayer filter, then aliasing/moire would
not happen, because the light value would be averaged over the whole sample.
It's the discontinuous aspect of what is effectively three overlayed photos
that is causing the aliasing.
Is this correct?
Nope. Aliasing is possible whenever the (spatial) frequency of the
image is higher than that of the sensor. The interesting thing is that
with 24 megapixels in an APS-C sensor you probably won't need an
anti-aliasing filter in all but the most extreme cases (the absolute
highest quality glass (at its optimum aperture), tripod mounting,
mirror lock-up, high shutter speed). The Nikon D800 is notorious for
demanding only top-shelf lenses and the pixel density of a 24MP APS-C
sensor is even higher.
I think the key parameter Larry made is "no space between the pixels".
What he is describing, more or less, is film, which was notoriously
difficult to get aliasing off of. I suspect that at 24mp with an APS-C
sensor, we are seeing, for all intents, no space between the pixels.
I just ordered a K3, as well as the battery grip, 35-135 lens, flu-card
and dongle from my local pusher.
I think I need help.
bill
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