I have a NL 10x42. The optics are pretty incredible. There is almost no distortion (I can’t see any), color rendition is as close to true as any binoculars I have ever used and they are clear all the way to the edge. The nicest optics I have used. The only gripe I have about them is under certain lighting conditions the image can glare. I own SLC, Zeiss Victory SF, and Leica Geovids as well. The Zeiss is very close to the NLs, but doesn’t have as wide a field of view and the color isn’t quite as rich, however I haven’t had issues with glare with them.