for 2011 Vortex has upgraded the viper and razor lines with HD glass...any thoughts on these? the 6x32's vipers are stellar so I wonder how much better the HD glass will make a 6x32
The original Vipers and Razors already had the equivalent of "HD" glass (think they called it "XD" in the case of the Viper), so I'm not sure what you are referring to.
It was all very unclear if the XD glass was actually an ED glass or just a special dispersion glass with not a big enough Abbe number to be ED.
It would seem from the new HD models that it wasn't.
Marketers, you really can't trust them.