Mike as we all know folk think I am crazy but my idea (And The Hubble) of extending you tube in effect with a baffled dew tube helps with stray light..even star light.
(Have a look at how Hubble is set up and how far the baffled tube extends) really does help..I may be crazy but the folk who designed Hubble hopefully are not.
The main thing as you say is being involved...is it a rental? If so rent it yourself.
Alex
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