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Old 27-02-2017, 12:27 AM
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barx1963 (Malcolm)
Bright the hawk's flight

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Happy Days!! Guiding getting better.

I have attached a screenshot of my guide graph taken tonight. In about 2 hours the guiding has moved between 0.63" and 0.73" total error. I know that that result would not be considered great but is the best I have achieved for a long time and with my setup it is pretty good. Anyway the stars are nicely round in my subs at the end of the day that is what counts!!

Malcolm
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  #2  
Old 27-02-2017, 12:28 PM
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Camelopardalis (Dunk)
Drifting from the pole

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Got to be happy with that Malcolm

You might want to dial up the y: scale to, say, +/- 2"...it may look a little more scary but it doesn't change the RMS

PS what's the focal length of your guide scope?
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Old 27-02-2017, 07:13 PM
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codemonkey (Lee)
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Based on how similar RA and Dec are, I'd be guessing that you're probably guiding about as well as seeing conditions allow. Can't ask or much more than that!
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Old 27-02-2017, 10:54 PM
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barx1963 (Malcolm)
Bright the hawk's flight

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Location: Colac vic
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Quote:
Originally Posted by Camelopardalis View Post
Got to be happy with that Malcolm

You might want to dial up the y: scale to, say, +/- 2"...it may look a little more scary but it doesn't change the RMS

PS what's the focal length of your guide scope?
Thanks Dunk. I find having the y: scale at that setting it shows what I need to see. I did set it to 2" once and found if one of the lines went a bit far I had to dial it back to 8" to see it was recovering and not to panic. The guide scope is 400mm (Orion bog standard ST80) I am imaging at 714mm with this setup and a focal ratio of f7. I have read that you should try to match the guide fl to the imaging fl, but have not really understood why?

Cheers

Malcolm
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Old 28-02-2017, 10:43 AM
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Camelopardalis (Dunk)
Drifting from the pole

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I think the crux of it is that you want your guide scope to see errors in tracking and can correct for it before your imaging scope notices.
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