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Thanks for your replies, and for bringing me back to reality.
I will also be using the lens for regular daytime photography.
But the main reason for getting it is to be able to do more "deep" sky work with my current setup including the iOptron skytracker. The latter which I would like to utilize as much as possible before moving on to buying a big EQ-mount and a real telescope for the really serious stuff :-)
I think I will be aiming for the Canon EF 200mm f/2.8L II USM Camera Lens.
What's your opinion on perhaps slapping on a canon x1.4 extender to get close to 300mm focal length, when and if I ever would like to do that. Would this destroy the ability to achieve focus at infinity? and what about the focal ratio.. I gues it will drop to 3.92 right?
Regards
Anders
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