i purchased these a few years back and recently used one for doing one beam work w/315 laser and found this mirror perfect to use as a primary expander (no lens needed),they are bigger than one inch sq, and have a positive focus around 2 inches,if any of you guys are interested ,i would accept a hologram made by you as a trade
the mirror i have been using , i cleaned to see how good of a coating it was ,and they cleaned up just fine.
i recently aquired a number of density filters i would be willing to trade, so let me know guys. i am going to attempt to build a forum gallery.