basically, the sony chip is optimized for consumer use, and is more sensitive to the wonderful greens of summer, and the lights of the city nights, and the kodak chip just happens to be similar in filter spectrum to a good set of astro LRGB filters, with the peaks closer to the good stuff (HA is alot redder than the vibrant reds in a daytime picture). The Kodak also has excellent sensitivity to the blue in galaxies, clusters and reflection nebula.
Using the same chip in my d50 in the past, 2-3 minute subs with 8"f5 newt, compared to the subs I got using an ST2000XCM with 4"f5.4 refractor (same F ratio) from the same site, the 2-3 minute subs had alot more sky noise (reddish brown ucky stuff) than 10 minute subs with the kodak CCD. See the picture of m45 in June issues of S+T and Astronomy (Opt CCD ad), that was taken with the ST2000 color, 10 minute subs. I remember shooting m51 when it was high up from the same site with d50, and there was alot more sodium glow in the image.
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Re: Anothe large color CCD for $1300???
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