As you probably already know, the original PST was designed as a visual instrument and as such it has proved very difficult to be used for solar imaging.
The usual "trick" is to remove the lens from a x2 barlow and drop that into the eyepiece holder - to increase the backfocus distance and allow the camera to come to focus.
I just found that Siebert Optics can supply a ready made PST camera adaptor. Neat!
http://www.siebertoptics.com/PST%20f...0adaptors.html