Guys, once you join ASSA you can then join their Deep Sky Imaging group. An excellent arena to share and develop skills.
By the way, I've just noticed Orion's field flattener:
http://www.bintel.com.au/Astrophotog...oductview.aspx
Quite a bit cheaper than the flettener/reducer unit, and it looks like a standard T-adapter thread too. Any thoughts?