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Yes it is a stack - about 90% of 80x 30 second subs. I used to get reasonable results with this set-up. I have a guidescope but I had trouble with it recently (probably due to excessive play in the RA gears). Also the attached picture is a crop.
I reloaded dss in case there was a bug. I also deleted the worst 40 subs and restacked @ 50% so only the best 20 subs were used. The stars still looked like rings.
Next clear night (which seem rare) I'll experiment with the position of the centre spike on the bhatinov pattern and see if the centre position is the best focus or not. I'll also try some visual focusing. Eventually I'll eliminate all controllable factors - can't do much about the seeing conditions though.
Hopefully I'm getting closer to a solution (and learning more). How do I attach bigger pictures - the limiting size is 200kb?
Regards,
Tony.
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