I was blown away at the difference, but there was a point where spending more didn't really get me more.I ended up picking up a used TeleVue 6mm Radian, at $130, it was the best value for the quality (which is awesome, BTW).I think that I might stick with Televue and maybe Pentax if I can find more of them used, because they are not only amazing optics, but used they are right at the perfect price