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Old 25-10-2013, 09:44 PM
WingnutR32 (Sam)
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WingnutR32 is offline
 
Join Date: Jul 2011
Location: Canberra, Australia
Posts: 283
Drift Align oddity

Hey IIS members,

I was just in the process of redoing my alignment on the AZ-EQ6-GT mount and noticed a strange occurrence.

Now I have usually followed the same process without an issue:
- Align with Alignmaster (3 iterations)
- Drift align with PHD making minor correction
- Double check with CCD Drift Align

Now, Alignmaster was pretty happy with less the 1 arc second inaccuracy. PHD was giving odd results in dy, drifting both north and south (doing elevation) in BIG sweeps, rather than the normal back and forth along the center line.

CCD Drift essentially confirmed the big sweeps seen in PHD, a really weird bow in the drift. (See attached 120sec exposure, moving north for 60sec, south for 60sec).

If I do a 2 min unguided exposure, it is definitely wrong, as the drift appears huge.
Attached Thumbnails
Click for full-size image (CCD Image 27.jpg)
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Click for full-size image (CCD Image 28.jpg)
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Last edited by WingnutR32; 25-10-2013 at 09:53 PM. Reason: Added 3 minute unguided exposure
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