Re: [APML] Huge periodic error

[Genehays2@aol.com]

Are you experienced at manually guiding your telescope?
Do you see this huge error when you manually guide?


<< After many months trying to do prime focus photography without success, 
I've
 discovered the reason: a huge periodic error that fails ST4 to track 
correctly.
 My instrument is a Meade 2080 Schmidt-Cassegrain 8". I've tried to measure 
the
 periodic error with the ST4 at the f/10 focus (4 arcmin field) but after 
about
 20 seconds the star go out of the field! So I can only think that the PE 
would
 be of about 10-20 arcmin (not arcsec!!) with a period of 8 minutes. Now it's
 obvious the reason I cannot do prime focus photos! :-( >>

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