[philman_36]

A 'just so you know' reply...How Far You Can See With 10×50 Binoculars?
An average human eye with 20×20 vision can see for about 30 miles if there’s nothing in the way. 10×50 binoculars magnify your normal vision 10 times, so theoretically, you can see for 300 miles. Unfortunately, there’s no easy answer to the question: How far can you see with 10×50 binoculars? Let’s go with “pretty far” for right now.

Atmospheric conditions affect the visibility.

[SunkenCiv]

The curvature of the Earth limits how far binoculars can extend observation of the surface, and transient atmospheric conditions can reduce it.