Unfortunately, Ant, you need to spend some money on HEAT! Everywhere but the primary mirror. OK, very mild heat - a few degrees above ambient is all you need.
Lots of threads on dew suppression so search through the fora. Waving hairdryers around - yes we have all done that. I think that is an interim step to something more sophisticated. Be aware that a 12V hairdryer will probably want to pull 8A or more of current and it still won't feel particularly hot (given that is around 100W compared to a mains powered hairdryer of 1500-2400W).
Heater straps and a heater controller and a reasonable size 12V battery or 12V power supply is the way to go.
Though I favour the heated eyepiece box, many cap their eyepieces between uses and pop them into coat pockets to keep them a bit above ambient.
Finderscope objectives will dew up. I've never found dew shields super effective so a heating strap on that is a must.
The secondary - I think you just have to go the whole way and fit a small heater on the back of it. This one:-
http://www.sdmtelescopes.com.au/shop...products_id=46
I created a thread on installing one on the back of a 12" scope secondary mirror. A bit of work with some fun getting the mirror out of the holder - but it can be done, with fantastic results.
Eric
