Before you decide how to choose binoculars you need to consider the solutions for differing environments. The need for using sophisticated equipment for viewing the stars has limited the number of participants.
Perhaps you are planning a sight-seeing trip to some exotic location. Those who have little room to stow prefer a monocular over a binocular. Telescopes provide an expanded view.
Apart from magnifying images, binoculars offer other functions also. The fog proof models have interior optical surfaces that won't fog due to rapid temperature changes or humidity. The waterproof models will be corrosion resistant and buoyant, not just repelling water from the lens.
A pair of binoculars that reads 7x50 can magnify things seven times stronger than they actually are with a 50mm objective lens. Many things, such as overall design and quality of glass impact this specification, magnification and objective lens diameter are the chief components. If the seals develop a leak, the nitrogen could leak out and allow moisture into the chamber.
You can catch any action with clarity immediately. Adding optional features and devices will also increase the cost but may be worth considering.
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