I have a scope (6-24 x 56) that is crystal clear at low mag, but becomes 'misty' at higher mag. It's still useable, but somewhat limiting in low light. It's also a pain as eye relief is that bit shorter at high magnification. It's as if a small amount of light is being reflected across the objective. It's not an issue I've had before - anyone else come across this/got any bright ideas? I am wondering whether it is as simple as atmospherics at the moment - but this would be too easy an explanation - isn't it the law that these things have to cost you money?!