Quote:
Originally Posted by Ian Robinson
Can't wait to get my 40D and 70-200mm f/2.8 L IS .
How have you mounted the lens + camera on the EQ6 ?
I am thinking of an arrangement that used both the lens mount and the camera mount, to keep lens and camera as rigid as possible.
Also wondering if a teleconverter (1.4x L style) is worth getting ?
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Hi Ian,
You may not need to mount both lens and camera.
As I recall the f2.8 comes with a sturdy tripod ring adapter.
I attach my f4 lens/tripod ring to the mount with this handy dovetail bar...
https://www.bintelshop.com.au/Images/Stock/7734X.jpg
(about $30 from bintel)
Combination is rock solid.
I use the EF 1.4x extender with my 70-200mm f4L and it's great.
This Eta pic was taken at 280mm FL, with lens + extender...
http://s231.photobucket.com/albums/e...A-POST-MOD.jpg
Stars are still points out to the edges of the frame, gotta love that!!!!

Drops f ratio one stop, but I wouldn't say that you needed to double exposure times though.
1.4x gets a good rep, but the 2x isn't as highly regarded I've read.
Cheers
Doug