Smallest Set Up for Backpacking Astrophotography.

[sabana]

So far I have got it down to a Skywatcher 80ED and EQ5 and some kind of guiding sytem (CCD guided). THis is not that small but to get decent long exposures I can't see a smaller system (yet). This is for DSO not planetary. Any thoughts ?

[Ags]

I don't know much, but would have thought DSLR + lens + astrotrac would be more practical...?