I have it set to F9.5 as it is as close to F10 as it can get. Yeah, we figured out last night that we are gonna have to get an autoguider. That's next on the list. I'm also going to order the "Premium Eyepiece Projection" kit from
this site as there deluxe prime focus kit works pretty good. The other reason why is the Celestron 1.25" 25mm eyepiece that came with the scope is too big for the deluxe prime focus/eyepiece projection kit. And if I'm going to order the Celestron Eyepiece kit from
B&H I want to be able to use them as the Wife loves the Celestron Ultima LX eyepieces (the do look at lot better than the standards).