Quote:
Originally Posted by Peter Ward
In truth I could leave the focus for months, hence I suspect any variation was
my fixing what wasn't broken in the first place.... .
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I confess that I was also in some disbelief that the combination of sitall and carbon fibre meant I didn't have to refocus. Once I focus in good seeing now I just leave it alone. With parfocal filters, refocusing is essentially uneccessary. I do let the scope and observatory equilibrate for 30 mins or so before imaging but my mirrors rarely get to within 2C of ambient
. I do tend to do a focus run occasionally but all that does is confirm that I didn't have to ... even after large ambient changes! My imaging system is F8.7 too so the large CFZ will be contributing to this stability as well.
Cheers, Marcus