These are a very nice pair of optics from Vortex whom I trust very much. I love Vortex, they make awesome stuff and it's cheaper than most other professional companies. These are also a suitable solution for amateurs that have some birding experience and want to improve it by having some good optics. They are waterproof and fog proof. They have a minimum focus distance of 4.9 feet and are equipped with phase corrected roof prisms. Some other cool features include: XR multi coatings, deluxe 5 element eyepiece, and extra tough armor. The armor that is on the Vortex Fury is specially designed to withstand very rough handling. They use Argon instead of nitrogen purging to prevent any internal fogging of the lenses. At 1.3 pounds the Fury's are incredibly easy to carry around. This pair of optics was also crafted to ensure that more light comes into the eyepiece giving you the clearest image. I hope this review helped in any hard decisions! Have a good day everyone. And as always, have a nice day.