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Originally Posted by alistairsam
I'm in a similar situation as Peter, but just to clarify, would the same targets be viable from dark skies with the dslr or is it to do with the 12bit resolution vs 16bit of astro ccd cameras and amount of data lost?
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I am no expert on this. Dark skies always helps but the 12 bit conversion does limit your ability to image dim objects as the total levels of the thing you are imaging may only be a few points higher than the background. This makes it hard to stretch the image. This is one reason why the 40D was a big improvment over its predecessors.
The imager is still useful but not as much for dim object pretty pics compared to a dedicated 16bit camera.