On Sep 4, 2012, at 11:54 PM, John Francis wrote: > On Tue, Sep 04, 2012 at 10:26:07PM -0400, John Sessoms wrote: >> >> I really like the concept behind the Foveon sensor - every >> photo-site captures all 3 colors like film did & no need for the >> anti-aliasing, but what's the deal with the poor image quality above >> ISO 400? > > Physics. If you don't have separate sensor sites for the three colo(u)rs, > then the photons for two of the colours have to pass through at least one > of the layers that contain the sensors for the other colours. > > To oversimplify the situation, you can't create a sensor that captures all > the blue photons, and yet lets 100% of the red or green photons pass through. > As a result, the second and third layers don't receive 100% of the photons > that they would respond to if they were the frontmost layer. This leads to > a degradation in sensitivity and in the signal-to-noise ratio.
I wonder if, with back illumination, you could do concentric rings for each sensor color. That way, each color would, on average, map out to the same location. Do it so that green has twice as much area as either blue or red. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
