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Hi Robin,
The problem for me with the phd graph was that it could vary a fair bit due to seeing and you'll have to make an approximation of whether it is drifting or not.
I've seen the graph stay steady for a minute or so and then start drifting.
I've tried this a few times and it didn't work too well for me. and I wasn't using dx/dy. I was just watching dec drift.
with the ccd method, I use 2x2 bin as that makes the trails brighter and keep at 30 to 1min exposures. that takes 2 or 3 tries. when that seems ok, then I go for 2 min at 1x1bin, either 1 or 2 iterations, and then I do one 4 min just to make sure. but by then, the drift in Dec is not noticeable.
basically that's what you're seeing with this method, how far the star has drifted in dec, just that its easier to make out visually as you can see it as a point and the line. you're slewing east/west and coming back to the same point. so since you've made no adjustments to dec, the start and end points should be very close.
As I mentioned, the EQASCOM script works brilliantly for me. I just make multiple copies and edit the values for each. so I have one script on the desktop for each.
John, I'm pretty sure you can script this with maxim. I'll have a go when I get the chance.
Which driver do you use and does the ASCOM one work for you?
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