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Most use 30-60sec subs on the infinity. And they are using faster scopes or a good whack of focal reduction which the small 1/2" CCD can cope with.
This and other cameras like the ultrastar (which has the same ccd) are being used to image DSOs in red zones.
I am envious. I just have a little zwo224.
Check out some broadcasts on nightskiesnetwork.com
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