Hello Doc
I know others have mentioned a Bahtinov mask, I have a Celestron 1100 Edge HD and really struggle trying to focus manually, the mask in my view is the only way to go, younger eyes may be able to focus but not mine, I also have a ED72 that I use as a guide scope, I was having trouble with focusing that and looked on-line and found a site that has templates that enable you to cut your own mask.
It was quicker to print a template out and stick that to a plastic cover off the back of a sketch book, 1/2 an hour later I had a mask that fitted and cost almost nothing.
http://www.deepskywatch.com/Articles...inov-mask.html
Just my 2 cents worth.
Ed