Thanks Guys for all your help.
Allan I'm going for CF because weight is a factor for me but thanks anyway.
Mario, how would the following go in that scope:
Baader Alan Gee Mark II Telecompressor (Flattener / Reducer)
http://tinyurl.com/d8quw55 ,
or:Antares 2" 0.7x Focal Reducer
http://tinyurl.com/clr7dhm
In Photographing a wider field?
Cheers!
Danny