[Retrograde (Pete)]

A quick update on this.
Whilst I was very tempted by the Borg 71fl the cost was just a bit too high to justify for the aperture I was looking at (especially once you added one of their field-flatteners at an extra $500+)

Yesterday I picked up an Astrotech 65 EDQ from an IIS member at a reasonable cost. It is pretty much the exact focal length I was after and with the in-built flattener it represented great value & should be a great little astrograph.

Down-sides are it's a bit hefty with four pieces of glass and a bit slow at f6.5 but still fits on the camera tripod and is small enough to pack in hand-luggage for travel so overall a good compromise.