Vortex Diamondback spotting scopes are good quality scopes in the $400 to $600 price range. Diamondback scopes come in 65-mm mid-sized and 85-mm full-sized versions in both angled and straight bodies. All are fully rubber armored and completely fog- and waterproof. Diamondback scopes also have ArmorTek-coated lenses, to protect them from oil, dirt and scratches.