Thanks all
No, Mike, cant make it to spsp.
If I had my rig at a dark site with Orion nice and high, Id do about 2 hours of Subs and go nice and deep

Yes theres no reason why the MPCC wont work well with your scope. Its meant to work well from f4 to f6 though I suspect will also do well under f4. It makes a big difference with my 6 inch f3.6 schmidt newtonian.
Info here
http://www.baader-planetarium.de/download/mpcc_e.pdf
Yup would be good to try it out on your scope Mike
Scott