I have the Legend Ultra HD spotter in 12-36x50. It is larger than other 50mm spotters I am familiar with, but still a lot smaller than any 65mm. In my experience, like any spotting scope, don't expect best performance when you zoom the eye piece to less than 2.0mm exit pupil. This one works pretty well to 30x, but the sweet spot on mine is 24-28 or so. It can get a little dim going to 36x and is best in bright light. One thing I can also say is that regardless of what size spotter you have, the best thing you can do for it is to be sure you have it on a good ,steady, and solid tripod. With a lightweight scope that means the tripod may be spendier than the scope.