Bill wrote: >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.
It isn't because of the "space between pixels", which has no effect on aliasing. Film doesn't experience aliasing because of the random distribution of the grains. -- Mark Roberts - Photography & Multimedia www.robertstech.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
