Hope to hear some focusing tips from more experienced members.
Currently, I use the frame and focus function in Backyard EOS with DSLR and ED80. On a "good" night, I can get FWHM around 3.5 (been using Antare as the focusing star).
But most of the time, I get around 4.
I am imaging from 10km of Melbourne CBD so guess LP is a factor.
I also use a fairly old R&P single speed focuser on my ED80 (I replaced the original single speed crayford).
Should I clean and regrease the focuser (stay with R&P or back to crayford?)
What other tips would you recommend? (moving to a dark site 3 hours away is not an option
)
Bo