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Quote:

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If you do a good drift alignment, you should be able to go 2 minutes without guiding.

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I think that's a bit unrealistic for a stock Atlas and a 1200mm focal length. Typical periodic error of the Atlas is 15 to 20 arc-seconds peak-to-peak, and with the Sony Alpha 350 on a 10" f/4.7, the resolution is about 0.9 arc-seconds per pixel. Guiding will be mandatory at that focal length for anything over 30 seconds due to PE, regardless of the polar alignment accuracy.

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Hi Don,

DO I interpret correctly that you refer
to imaging wihtout using VS-PEC ( in case
of using EQMOD ) ??
If so, typical residual PE would be around
+4 -4 seconds I believe.
Then using PHD on top of this will get you
around +1/-1 seconds average, which is way
below my average seeing over here :-(

Regards,

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Mert
42º49"N 1º38"W
3" Unitron refractor
6" F12 SW Maksutov,CS2-S
EQ6 + EQMOD
Webcam with 1.25" nosepiece

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