I did ask if it made sense Gary
Guess it was about being able to use the DSLR if I wanted to. For example the other night I had the DSLR in a 2x barlow (have to to acheive focus with my newt) and was watching Jupiter magnified on the lappy via liveview etc. The D90 takes avi's as well so I guess I wanted to have a play with that at the increased image scale a 4x powermate would give me thus needing to stay 2"
That make any more sense?