Bob,

Yea i know about the upgrade to make your extreme an elite, and i am 100% sure the dust is inside the prism. I've cleaned all around the ground glass, and also behind the achromat. (which im pretty sure isnt an optimized one)

However like i said in my first post, selling off the extreme isnt hard to do, so my issue isnt extreme vs elite, its elite vs SGBlade.

Cheers for your help though.