one thing myself and the others found the hard way is that in cameras other than the 350D, scraping the blue area causes irreparable damage and renders the sensor unusable.
so i'd suggest staying away from the blue for 450d and above.
mono 350D is proving quite a performer with its largish pixels with some good examples. so a cooled 350D should be very usable for deep sky imaging and especially Narrow band.
are you running the camera without the body?
Cheers
Alistair
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