A really good result Scott and even better than I imagined for that combination of a cooled Canon DSLR and very fast quality telephoto lens.
I was thinking of taking some images of Carina with a Halpha fiter plus the 5DH and the 300mm F2.8L. With a further twist by doing a high dynamic range image with EasyHDR. That way all the very faint nebulousity would show without blowing out the brighter parts of the nebula. With the cooled camera your abilty to get very long exposures with a lot less noise means you could go very deep.
The further possibilities of your combination for narrowband imaging would also be spectacular.
Bert
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