Thanks Gav, yeah I was reading up about it last nigh on this old thread.
http://www.iceinspace.com.au/forum/a...p/t-67354.html
People said pretty much what you ve said here in that it might be ok for visual but would be really pushing it for photogaphy. Some people said they were getting good results with this combination but yeah I am not going to risk it. I'll stick to a 10"
Thanks again mate
Jason