Quote:
Originally Posted by raymo
Can anyone help? I have been happily doing subs up to 100-120 secs
with my 8" f/5 Newt for ages. Of recent times I have been aligning using
Sirius and Fomalhaut. All good anywhere in the sky. The last two sessions
I have used different stars [Rigel and Achenar], and my tracking has gone all weird. I got round stars on the Rosette at 60 secs, so thought my tracking was poor, but acceptable for what I was planning for the session, but on the LMC could only get round stars up to 15 secs. Went back to the Rosette and got 60 secs again, but even 60 secs is way short of normal. I have a little out of balance to keep the gears meshed. It didn't
matter how many subs I took; the very poor tracking stayed the same.
I'm not even sure that the poor tracking has anything to do with the alignment process, but I can't think of anything else that has changed.
raymo
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I suggest you use an OAG.