The problem is that the diamonds are somewhat sharp and slippery (for lack of a better description), coupled with fairly stout tension/clicks to keep them from turning since they lack locking turrets. This means you need to grip the turret harder in your fingers while turning than pretty much any other scope I have owned. If my hands are dry or I am wearing gloves this isn't a problem, but if its hot, humid and my hands are getting sweaty down here, it becomes less fun. If you're thinking about the amount of surface area your hand is actually twisting on its not all that much compared to other setups.
This doesn't mean the scope is bad or that you shouldn't buy one, but the texture design was sub-optimal and whoever finalized it should have been wacked with a floaty pool noodle several times. Things like this are what holds something back to being "great" instead of "excellent".
I've been happy with my 3-18x and haven't noticed any image worsening as I approach the top magnification. $900 for the US version is a phenomenal price and Doug is great!
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