[raymo]

I have the SW 8" f/5 Newt which works fine at prime focus, and using EP
projection with the necessary adaptor, but I can't find a way of using just a barlow instead of an eyepiece. A barlow won't quite come to focus when fitted into the EP projection adaptor. Also can anyone tell me if
I can use filters at prime focus. What would I attach the filter to?
raymo