Hope I can help you here Jason re the extender + scope question.
Here's a relevant link (sorry High Res image links are void now)
http://www.iceinspace.com.au/forum/s...t=tak+extender
Extender in question is the 1.4x
The 2x Ext I wouldn't go with as too many aberrations are introduced (I've heard!! - no 1st hand experience, have only owned the 1.4x)
Cheers
Doug