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  #81  
Old 13-04-2010, 06:11 PM
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Paul Haese
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Looks pretty good to me. Mind you I would like to see a larger version Pete.
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  #82  
Old 13-04-2010, 07:55 PM
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Yeah unfortunately I cant post a larger one here.
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  #83  
Old 09-07-2010, 02:30 PM
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wasyoungonce (Brendan)
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G11 DEC errors

Just jumping on this thread for advice guiding advice, G11/PHD.

My G11 is really behaving & guiding nicely in RA but DEC guiding starts off with an awful error~14 to 11 arc sec's. I noticed some slight elongation in my stars and I'm attributing this to my DEC.

I noticed that the error is large at the start of guiding but smooths down quickly to acceptable level. I only wait a few seconds between PHD "starts guiding" before starting exposures...maybe 5 seconds at best. Should I wait longer?

Anyway any ideas on cause of the DEC issue?

All graphs on 05/06 Jul and I changed from 3.0s guiding iterations to 3.5 sec's on the 06 jul. RA graphs are corrected for declination angle.
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Click for full-size image (RA for 06 Jul small.jpg)
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Click for full-size image (dec 05 jul small.jpg)
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  #84  
Old 09-07-2010, 03:00 PM
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multiweb (Marc)
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I usually bump the mount to dither then give it 20s minimum to settle down. The way I look at it is what's 20s more in your imaging session when you do 10min subs or more anyway.
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  #85  
Old 09-07-2010, 03:14 PM
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wasyoungonce (Brendan)
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Thanks Mark...This is what I'm thinking...I'm not allowing guiding to settle before starting subs?

It appears DEC does settle by itself...just takes awhile.

I like the idea of dithering subs...on my to try list.
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  #86  
Old 09-07-2010, 03:35 PM
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multiweb (Marc)
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Quote:
Originally Posted by wasyoungonce View Post
Thanks Mark...This is what I'm thinking...I'm not allowing guiding to settle before starting subs?

It appears DEC does settle by itself...just takes awhile.

I like the idea of dithering subs...on my to try list.
When I first calibrate PHD and it starts guiding my DEC usually goes its merry way. I then go for a cuppa come back when the backlash is gone and the worm is loaded and guiding then I check the direction of the drift, sets the guide against it and set the max dec duration to 500ms and that's it. When Neb downloads the pic it pauses guiding so DEC will go one way or the other. When PHD's back it will pick up the DEC back then start guiding again within those 20s and I get another sub started. Works quite well. Don't loose too much sleep over DEC.
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