Thanks Tony, familiar with the ED80s - was actually looking at that and wondering if I should just use that - or a 100 for personal viewing as well as photography. The 80s are f7.5 and 100s are f9 - this is going into dusty territory for me though as I don't know much about how that affects the shot.
Still, I guess as long as the Dob + ED (+ camera + whatever else tacks on) doesn't go over about 12kg then I should be clear - is that about right?
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