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Old 03-29-2011, 02:06 PM   #1
Buck Buck is offline
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Originally Posted by Dave Lane View Post
Had to put this up, its not mine but its a 60 hour exposure in 4 sections of the Orion nebula, Horsehead nebula and the flame nebula. I know the guy who did it and had to share. I thought it was tits.
How exactly do you keep a 60 hour exposure without noticing any movement? I mean the Earth is moving, right?
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Old 03-29-2011, 03:07 PM   #2
Dave Lane Dave Lane is offline
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How exactly do you keep a 60 hour exposure without noticing any movement? I mean the Earth is moving, right?
Well his exposures are over 2 months time and yes that is what really tough about doing this. Usually you do 10 minute "subs" at a time then stack them in software to gather all the light from the different frames. If the scope varies by 1/32 of the width of a human hair anytime during the 10 minute subs the shot is ruined and you have to toss it out.

The mounts that guide the scopes for the pictures are insanely complex. And expensive for the really good ones.
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