I know this is old - but an observation that's slightly off topic, but still may be relevant for others. I bought a Vortex Diamondback 20-60x85 and an Athlon Argos 20-60x85, and the Athlon was not even close to the Diamondback. In fact, the glass on the Athlon was so bad that even with focusing as best I could, the image didn't even look like it was focused anywhere above ~2/3 of max power. The chromatic aberration was terrible as well. I am wondering if I got a defective model, but at any rate, it's getting returned. I see all these posts of Athlon raving reviews, but for me in the Argos line, it was not great.