Re: Autoguider correction frequency
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Woodwind
Roy,
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I started the thread and I was not specifically talking about the issues you raise. I might have missed some posts - but the main theme was whether to use low aggressiveness levels and plenty of feedback from previous readings and then correct more quickly to minimise actual movements - or to allow the mount more time. I have a friend with a Paramount ME who says that that system corrects up to 10 times a second. I was assuming good polar alignment was taken as read. Not sure if this alters the price of fish- but it might clarify some of the background to the thread. On the basis of yours and other comments, I am certainly going to try a longer exposure setting this week-end - weather permitting. Murray roy uyematsu <roystarman@...> wrote: I am very late to this discussion but from what I’ve read, I think you maybe making an assumption that is not true. That is Autoguiding can help to overcome polar alignment issues and mount problems. To some extent this is true but the real reason for autoguiding is to correct errors in the RA drive periodic error and others. If you are having to make regular and large declination corrections then you have either a polar alignment issue or a backlash issue. You should be working to minimize the number of corrections required, not trying to determine the fastest rate you can put them in. As you have stated each time the mount moves there is settling and other issues. So it seems very reasonable that you want to minimize the movements. Try get to a regime of 5 second as a minimum and probably more like 10 to 15. If you use narrow band filters you will probably need 20 to 30 seconds perhaps more to find a good guide star. Roy Uyematsu roystarman@... _____ From: ap-gto@... [mailto:ap-gto@...] On Behalf Of Murray Hammick Sent: Friday, March 28, 2008 12:25 PM To: ap-gto@... Subject: Re: [ap-gto] Re: Autoguider correction frequency I use the Orion SSAG with an AT 66ED and AP900 using the on-camera setting and a refresh rate of .5 sec. Seems to work well - but will try it at one and five seconds this weekend. With very low settings for aggressivenss and high averaging, the shorter exposure times seemed more rational - but per the above I iwll try it on much slower settings Murray Gedas wrote: Correct, it's the orion AG'er. Gedas HYPERLINK "http://gedas.cc"http://gedas.-cc HYPERLINK "http://www.w8bya.com"http://www.w8bya.-com
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From: "hewholooks" "mailto:hewholooks%40yahoo.com"hewholooks@...> To: Sent: Friday, March 28, 2008 11:53 AM Subject: [ap-gto] Re: Autoguider correction frequency So you are using your "on camera" guider and not something like a DSI"Gedas" wrote: "mailto:ap-gto%40yahoogroups.com"ap-gto@..., "Gedas"ASCOM wrote: "mailto:ap-gto%40yahoogroups.com"ap-gto@...>withweek I "http://groups.yahoo.com/group/ap-gtoYahoo"http://groups.-yahoo.com/-group/ahaveSent: Thursday, March 27, 2008 4:18 PM p--gtoYahoo! Groups Links "http://groups.yahoo.com/group/ap-gtoYahoo"http://groups.-yahoo.com/-group/a p--gtoYahoo! Groups Links "http://groups.yahoo.com/group/ap-gtoYahoo"http://groups.-yahoo.com/-group/a p--gtoYahoo! Groups Links [Non-text portions of this message have been removed] No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.1/1348 - Release Date: 3/28/2008 10:58 AM No virus found in this outgoing message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.22.1/1348 - Release Date: 3/28/2008 10:58 AM ------------------------------------ To UNSUBSCRIBE, or for general information on the ap-gto list see http://groups.yahoo.com/group/ap-gtoYahoo! Groups Links
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