Finally I got my prism, too. I bought the non metered model...the square one. Not the round one...(you can see it here: http://twitpic.com/v57c1 )
But it's quite dusty inside. Has anyone ever tried to clean one of those things? I can see some screws, but will I be able to access the glass prisms when I open it?
And if yes: what's the best way to free it from dust?
Hope someone can give me some advice:-)