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"Also 17 inches at F4.5 and 77% QE actually burns out the core of galaxy NGC1097 in a 10 minute sub! So a lot of photons being recorded.
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Wow, mate, that just sounds insane! I know DSLRs have the bayer filter (reduces spacial resolution by about SQRT(2), but you need colour filters that would reduce QE with the dedicated astro cam. They are talking 50% QE with the bayer filter on for DSLRs, and DSLRs have quite a well depth also. Yes you can cool a DSLR, but not as much as a dedicated astro cam. Is it the dark frame noise that the super-cooled astro cams have the advantage? Or the flexibility of the use of narrow band filters to reduce star size (maybe irrelevant with galaxies)? Are RAW files really Raw files with DSLRs? Or have I just answered my own questions? Any thoughts with this one? Great shot btw Greg! - You must be stoked with the brute photon capturing capacity of that 17" beast!
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