Any good designed binocular, whether the U.S. specification design or the center focus design, will have Bak-4 prisms, fully multi-coated lens, air-spaced objectives, and nitrogen filled tubes sealed with o-rings to water proof the binocular.Bak-4 prisms, fully multi-coated optics, and air-spaced objectives allow for better light transmission, and therefore, a better view. Air-spaced objectives allow for better resolution. The nitrogen filled tubes sealed with o-rings keeps water, whether of the liquid variety or the vapor variety, from entering the binoculars system and causing mold or mildew to grow.

Vixen Optics' Atrek II 8x32 DCF Binocular gives you a compact optic that fits comfortably your hand while having the benefits of a nearly full-sized binocular. A combination of features work together to produce bright and clear images with increased contrast and true color rendition. These features include BAK4 roof prisms for improved color and contrast, anti-reflection fully multi-coated optics which limit light loss for brighter images, and field flattener lenses which virtually eliminate distortion at the edges for clear images across the entire generous field of view. The Atrek is offered here in a 8x power which provides a nice general purpose magnification with a wide 60° apparent angle of view.
Granted, most of the interesting astronomical objects that binoculars can show will appear very faint in them. But most objects that a telescope will show also appear very faint in it — certainly much fainter than you would like. Moreover, the map-using skills that you'll gain using binoculars to hunt out these dim, distant things in the dark wilds overhead are exactly the skills that you will need in order to put a telescope to good use.
The Swarovski EL series has been the upper echelon of hunting optics for years and the EL Range is no different. Swarovski rates this unit to 1500 yards, which is a fairly accurate limit. The EL Range doesn’t have the raw ranging power that the other high end units have but for most hunters having the ability to solidly range past 1000 yards is plenty.
There is also a lot of additional functionality with the BinoX-HD. For example, seeing as you have a sensor that’s capturing the image, there’s the ability to take a picture, or record video. The video can be either 1080p, at 30 frames per second, or 720p, at 60 frames per second, which is pretty good. At night, they’re very good, until you go past 10x magnification. This is where you’ll be having some issues, which is to be expected, honestly. However, when you consider the package of functionality you’re getting at the price ATN ask for the BinoX-HD, you’ll find that it’s very much worth it.
True, the differences in data between your left and right eyes are integrated into depth information by your busy mind. Even though the vast distances of the universe make it challenging to perceive depth, if you inform yourself in advance with some knowledge about the objects you are going to be observing, you can begin to see the universe in 3D. Binoculars make this mental gymnastics faster and easier.
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