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  #21  
Old 21-11-2006, 09:12 PM
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Lee
Colour is over-rated

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Location: Newcastle, Australia
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I set up on grass. So I have spray painted the leg positions on the grass! Put the tripod down, check for basic leveling, then balance scope and hook up cables. Make a model, I'm usually about a degree or so off in azimuth, and fairly close altitude (<10min usually).
Then I drift align until there is no movement at the meridian for at least 5 minutes.
After this the numbers have been reading single figures..... this all takes at least an hour - first night or two, it took all night....

I've just discovered that after making a model I can tell Gemini to point directly at the meridian/equator intersection for azimuth adjustment.... just key in the appropriate RA and Dec 0 and drift away.... I find elevation doesn't need adjustment, which is good, because stars low down in east/west here are hard to find, let alone drift with!

We are buying a house this month, and a roll-off-roof obs is very high on the list! Happy days ahead!

No guidescope as yet though.
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  #22  
Old 22-11-2006, 12:29 AM
jase (Jason)
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Well done Lee. Long exposures will definitely see some improvements.
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  #23  
Old 22-11-2006, 09:12 AM
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[1ponders] (Paul)
Retired, damn no pension

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If you are getting no drift for that long there must be some other reason you can't take unguided exposures for longer. What's your periodic error like? Have you thought of putting a couple of small pads down for the legs, so they don't settle into the turf and soil during the night?
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  #24  
Old 22-11-2006, 05:33 PM
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Lee
Colour is over-rated

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Not so much that I can't take them - just haven't really pushed it yet.... with the weather being so bad of late I've only had it outside maybe 8 times. Periodic error - no idea!
Will definitely bump it to 2 minute subs next outing though.....
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