Oh no, I didn't even realise they were roof prisms... and it says it right there. I think I assumed (big mistake!) they weren't becaue they didn't look like the typical roof design, at least to me. Thanks for pointing that out Daniel.
Andrews have some 11 x 70's that are "broadband fully multi-coated", not sure what the broadband is really meaning, for $149. I can't direct link to them, but they're just about half way down the page here:
http://www.andrewscom.com.au/site-section-11.htm
These aren't roof are they? Am I right in thinking the 11 x 70's will be a better compromise for LP/dark skies?
If not I may just go for a cheapy pair of 10 x 50's and look at a 2nd set down the track pending how they go for a few months.
Thank you again