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sdisburning
member
Reged: 02/24/06
Posts: 38
Loc: San Diego, CA
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I was having a very hard time drift aligning my lx-90, until I figured out that I had to set a custom tracking rate of about +60! Is this normal? And this seemed to vary up and down throughout the night, leaving me with few usable photos. I'm thrilled that I finally figured out my initial problem, but now I'm really confused with this new one. Please help!
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8" LX-90
Standard Wedge
Digital Rebel XT unmodded
<a href="http://www.flickr.com/photos/eag/">Flickr</a>
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JAT Observatory
Space Freak
Reged: 02/20/05
Posts: 5866
Loc: Eastern PA
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I vagely remember having to set the tracking rate on my LX200GPS to about 66.
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-Marcus
The problem with free speech is even the stupid have a voice.
http://jatobservatory.org
12" LX200R on a Paramount ME
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Nick Cook
Pooh-Bah
Reged: 01/28/06
Posts: 1046
Loc: Somerset, England
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That sounds very high. Using an autoguider, logging the data and looking at it in a spreadsheet chart, I could see that my RCX was running slightly fast in its sidereal rate (the autguider kept having to make corrections to slow it down). The custom tracking rate as far as I'm aware (and if I'm wrong on this, I'm sure somebody will jump in), is a variance on the normal sidereal rate. Through experimentation and looking at the autoguider data, I've ended up with -05, i.e. -05 off the the standard sidereal rate. Of course the LX may be set up differently to the RCX...
I believe the guiding rate (as opposed to the tracking rate)on the Autostar is set to 66 though.
Cheers,
Nick
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Meade 14" RCX + Astro Physics 0.75 Reducer (27TVPH)
Meade 5000 ED80 APO (Guider/widefield)+ WO 0.8 Reducer
William Optics Zenithstar 66 Petzal
SBig STL11000M + AO-L + 3" Pyxis Rotator + 3" PDF Focuser 
Canon 20Da + IDAS Filter
Pulsar 9ft Dome
www.nick-cook.net
www.cavebear.co.uk
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JAT Observatory
Space Freak
Reged: 02/20/05
Posts: 5866
Loc: Eastern PA
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Ding ding ding ...give that man a set of free steak knives! You are correct Nick. It is the guiding rate. I just remembered a number of 66 for a rate. Thanks for setting me straight.
(Disclaimer..I am old and have a bad memory).
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-Marcus
The problem with free speech is even the stupid have a voice.
http://jatobservatory.org
12" LX200R on a Paramount ME
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