What did you use, Dr Who? - for camera I used a pentax K10D. Camera settings for that particular image was ISO 400, Shutter Speed 1/125 sec. I did do one at ISO 200 at I believe 1/30th a sec and lok to be just about the same quality. Maybe slightly more detail but more noise at the ISO 400.
As for the glass infront of the camera I used a 7" Maksutov-Cassegrain Telescope on my balcony. There is a street lamp in the balcony almost directly in front on it too which doesn't help but the moon is extremly bright so it came out ok. Stats on the telescope is F15 with a focal length of 2700mm.
That might be with the eye piece setup I don't know if it changes with the camera inserted in there but if it does its neglegable. Telescope does have a tracking motor but was not a open area to triangulate its location. That and again the lamp outside the balcony lol. The Moon, least here in Edmonton is a very late night/very early morning riser atm and the sky was turning blue. I had posted some smaller photos in another forum that I'll include here.
the moon looking out my balcony with lovly street lamp post. Jupiter to the lower left as well. I wasn't 100% what it was until I looked at it
not bad for living walkign distance from downtown and sun starting to rise.
Jupiter over exposed on purpose for 1 second to reveal its moons.