Re: HD or Non HD Swaro STM
Before I bought my spotting scope, I did a ton of research. Spent most of my time on the bird watcher forums. Those guys know way more then hunters do about glass. What I found out was HD glass was to control chromatic aberration. This will make for a sharper image but not in and of itself a brighter image.
That being said, I would opt for a 65mm HD version vs. a 80mm non-HD version of a spotting scope.
Seriously, if you want to learn about optics, go research on the bird watchers forums.