Howdy. Ive been using my 10 inch telescope (focal length 1400 mm) as a 1400mm lens by attaching my EOs 300D directly to the telescope and shooting through it. The skies arent very dark in suburban newcastle, so I tried using a nebula filter that blocks out much of the unwanted "light pollution" but allowing most of the light of specific colours that astronomical nebulae give off. heres a shot of the Eagle Nebula http://www.users.on.net/~josiah/baader/Eagle baadersmall.jpg Its 2 ISO 1600 shots each of 15 minutes duration then stacked together using Photoshop CS. The nebula filter makes a big difference. I then use Levels in Photoshop to make the sky nice and dark. The Eta Carina Nebula http://www.users.on.net/~josiah/baader/Etacarina 2x15iso800baadersmall.jpg The Lagoon Nebula http://www.users.on.net/~josiah/baader/Lagoon deep_filtered2.jpg The Triffid Nebula http://www.users.on.net/~josiah/baader/triffid1hour_filteredsmall.jpg The Helix nebula http://www.users.on.net/~josiah/baader/combohelix_filteredsmall.jpg My telescope is nearly 20 years old. When I bought it I never dreampted there would be cameras I could attach to it that could get images like these, especially from the light polluted skies of Newcastle.