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Well I am still waiting to hear from Craig Stark, but I sense my issues are two fold - alignment - more drift processing to do and seeing fluctations on the guide rig (OTA / CCD combination).
I think I got it even better last night (until 1am when I played with PEMPro for 2.5 hours (its Polar align routine) and ponder did I improve or worsen things... But I will try a marathon driftt alignment soon - I am sure I need more experience in this...
On the guide scope OTA / CCD combination, well I would love some advise as to what I am seeing and how to address it.
I watched a star last night and read of the RA / DEC (x / y) pixel positions in PHD every two seconds. What I saw went like this:
RA (x) / DEC (y)
392.2 153.0
392.0 153.1
392.2 153.0
392.2 152.9
391.9 353.1
391.9 353.6
391.1 352.9
391.9 353.0
391.2 353.0
351.3 352.9
351.9 352.3
etc - 30 minutes later - real drift had occurred and the observations went:
383.2 151.0
382.9 151.1
383.0 351.0
383.0 350.9
383.1 350.9
352.2 351.0
382.1 150.9
50 minutes after this results were
356.8 153.9
356.9 154.0
356.8 154.7
356.0 154.1
So here is my challenge - is that much variance in readings showing a focus issue (collimination) seeing issues - CCD pixel size to OTA mis-match or something else?
How do I account for it - do I simply find software other than PHD that can track multiple stars and average out seeing shifts - should I change to a different guide scope and/or CCD?
What do folk recommend will help me the most please?
Last edited by g__day; 03-01-2008 at 07:34 PM.
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