1. When choosing a Nikon binocular, consider the specific function you need them to serve. Birdwatchers will have different light allowance and lens needs than sporting event spectators or stargazers.
2. Focus-free, or "fixed-focus," binoculars are highly convenient and easy to use, but keep in mind that you will lose the ability to self-adjust as needed.
3. A porro prism binocular allows for brighter, crisper images, but they are larger and heavier. A roof prism binocular is more streamlined and comfortable, but let in less light.
4. The larger the exit pupil, the more it allows light in. If you are planning to use yours for astronomy or birdwatching at dawn or dusk, look for a larger exit pupil.
5. For water enthusiasts, binocular models are available that are 100% fog-proof, waterproof, and slip-resistant. Some are even completely submersible.
