I'm not a science guy so I don't know all the etch specs stuff. I was a double major in Literature and History so that tells you where I come from. All I can tell you is things through these are sharp and clear. These are the best binoculars I have ever owned. Another reason I wish I could still walk right as they would be great on hikes.
However, for spying on the neighbors they work great!
I admit, when I ordered this set of binoculars, I wasn't sure what I was going to do with them. I do, on occasion see a play or go fishing, so what the hey, perhaps I'll give it a shot and order it through amazon's vine program. Vanguard has a reputation for coming out with high quality lenses and great design, and this model Endeavor is no different. The design is pretty stylish with a finish that can easily be gripped and to make things more attractive, … more
Endeavor ED has BaK4 roof prisms and special lens coatings for unbelievable quality. Nitrogen-charged and O-ring sealed, Endeavor ED is waterproof and fogproof to take on challenging weather conditions.