http://www.rfroyce.com/standards.htm
In my quest for optical perfection

I have encountered a term I was not familiar with (amoungst the several hundred) and decided to find out what it was and how it would effect my scope purchase. I was looking at a scope with values of 1/6.2 wave, 94% Strehl, resolution 0.890 arc-seconds.
Now there are several Aficionados out there, can they help fill in the blanks?