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Old 17-12-2005, 01:24 PM
Xeelee (Chris)
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LPI Autoguiding

Are there any problems with using Meade's LPI for autoguiding (limited choice of stars etc.)

Thanks

Xeelee
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Old 17-12-2005, 02:33 PM
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No, they work fine.. Although I'd steer clear of the Meade Envisage software. Use K3CCDTools or something like that. What's your guidescope? I use a 80mm and never really have a problem finding a guidestar. Although I have plenty of adjustment available with my rings.
Cheers
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Old 17-12-2005, 02:43 PM
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Would the LPI be better for guiding then the toucam seeing you take a longer exposure..I think up to 15 seconds.

So that would put it in the class as a Modded Toucam.

Even though you wouldn't want to use 15 seconds for guiding...even 1 second exposures are a lot better then 1/4 of a sec the toucam can do.
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Old 17-12-2005, 03:27 PM
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Just remember guys no one should be guiding on exposures less than 1 second. For this reason the LPI is a better option for guiding.

All you will be doing is chasing the seeing with short exposures. Any mount that needs corrections as often as every 1 seconds is not suitable for astrophotography….The best guiding is none at all....
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My guide exposures are typically 3 – 5 seconds….. but this means you must have had a very good polar alignment ad decent PE on your mount.

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Some good reading and listening on the subject can be found here…

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http://www.ccdware.com/resources/autoguidercalc.cfm

http://www.ewellobservatory.com/bestpractices/

Regards
Chris Venter
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Old 17-12-2005, 04:12 PM
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Quote:
Originally Posted by cventer
Just remember guys no one should be guiding on exposures less than 1 second.
Ummm, well, I have no problem with 1/25s exposures for guiding. Well I have no choice at the moment as this is as slow as my ToUCam guide camera will go. My guide interval is usually around 2s, and the software issues corrections about once every 3-5 intervals. Correcting for PE 99% of the time.
Cheers
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Old 17-12-2005, 04:34 PM
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I'm half way through this presentation.. http://www.ewellobservatory.com/bestpractices/
It is excellent!.. Thanks for the link.
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Old 17-12-2005, 04:45 PM
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Great link Chris thanks !
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Old 17-12-2005, 04:55 PM
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Be carefult that it doesn't put you off!! I got a little overwhelmed at the lenghts this guy goes to to get the "perfect" image...
The reality is that we can all get excellent images with modest equipment and low cost (or free) software, without getting obsessed with miniscul detail...
Interesting to see hwo the other half live
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Old 17-12-2005, 05:26 PM
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I should have been clearer in my post. Make sure your guide corrections are no closer than 1 sec apart. So if your exposures are less then as Robby is doing use longer guide corrections to compensate.

Regards
Chris
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Old 17-12-2005, 05:28 PM
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The best info to take away from the presentation is that the 2 major sources or error. ie Polar alignment and PE can and should be controled first. The info on guiding and stellar profiles is also great.

The software CCD Inspecotr he talsk about to collimate using a CCD camera is awesome. I got the latest version and played with it last night. I never collimate as I hate it, but this now makes it soooo darn easy....

Regards
Chris
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Old 17-12-2005, 05:53 PM
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That was a great presentation, thanks for posting the link Chris.

Definately explained alot for us new to imaging, it will be another reference point to return to for more tips and info.
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Old 18-12-2005, 06:58 PM
Xeelee (Chris)
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I use an off axis guider and not a guide scope and use a film SLR for Deep Sky.
I plan to use the LPI for Deep Sky guiding and for planetary work but it is the Guiding that concerns me. I there a limit to the magnitude of stars that I can work with?
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  #13  
Old 21-12-2005, 03:47 PM
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Can't remember where, but I recall reading somewhere that the LPI is capable of guiding down to mag 9.
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