The focal length is 600mm, and I think its an f/5 from memory (at work at the moment, don't have it at hand). I get a pretty good view of the Great Nebula in Orion, and can see a couple of the stars or the bright patches in it, if that gives you any reference point. That's with the Barlow and 20mm eyepiece. Interesting in that the 20mm and barlow together seem to give around the same magnification as the 6mm eyepiece by itself, but give a discernable improvement in clarity compared to the 6mm.
cheers, Graham
Last edited by gmeredith; 15-12-2008 at 02:19 PM.
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