All spotting scopes, with the excpetion of premiere and very expensive models, lose image quality as you zoom up in magnification. No scope at $500 will be as sharp at 60x as it is as 20x. That's a given. There is also the atmosphere to consider and no scope, even the most expensive, will provide sharp images at 60x when the atmosphere is not cooperating.
The best scopes I have tested at this price point are the Vortex Skyine and Alpen 788. _________________ Thanks for posting with us
Joanie K - Your personal optics expert