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Garcres
member
Reged: 04/10/08
Posts: 17
Loc: Spain
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Re: EM-400 spikes while tracking
07/16/08 01:50 PM
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Thanks, Chris.
These are only two examples within may be a dozen o sessions with different guiding paramenters and declinations on different days.
I already thought of increasing the FL of the guiding tube and used the TSA-102 (816 mm) with similar results.
Not being an expert, what impresses me most is that 0.8 pixels equal to 2.41 arseconds with my guiding setting, and the seeing never seemed that bad. I think I can balance the scope and guiding camera well, i.e., I don't know how to do it better (may be putting some more weight on the eastern side of the mount while guiding?). Besides, the same guiding setting, parameters and balancing get far better results with my Losmandy G11 (and that's no fair, is it?
Regarding the guiding parameters, I keep aggressiveness to 90 out of 100, because looking at the guided curve, after the ascending limb of the spike, the guiding software returns the star to the baseline or very near to it without overshooting. And use 3x3 noise reduction in PHD guiding.
But I forgot to mention a fact (excuse me): the RA has a little play when mooving the counterwaught shaft sideways by hand. Could it be that?
With Guidemaster, identical results.
What makes me think I surely need help.
Thank you very much again.
Pedro
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Takahashi FS-C 60; TSA-102S; Mewlon 250.
Losmandy G11 Gemini 4
Modified Canon 5D; QYH8; QHY5
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