Stan, Personally I don't think you will see the difference visually unless you can set them up like a binoviewer and switch back and forth extremely quickly. I have one of the designer 2" diagonals, it is machined from one piece of metal and this (I hope) pretty much guarantees square ness and alignment. I am to lazy to dig through the boxes to find out who makes the one I have. I am going to crawl out on the limb and state alignment issues of the mirror or the mirror distorted from mounting stresses. Beevo BTW, you should have come with us to Nightall, a good time was had by all. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.