A lot of things are different in the Movie Universe, especially in action movies, than they are in the real world, and most people have simply accepted the conventions.

The "field glasses" view looks like that so the movie audience knows they're looking through field glasses. It's part of the same magic that lets the view through a telescope in the movies flawlessly track the person being watched through the telescope.

A few other things:

-- Cars in the movies always explode when damaged. I have yet to see this happen in real life, even to a car burning like a torch.

-- Lava in the movies is only hot if you actually TOUCH it. Look at countless action movies where people are dangling over or fighting near a seething pool of lava. In real life, I was about twenty yards from a very small lava stream in Hawaii, and I was this close to losing my eyebrows.

-- Two people can kick the living CRAP out of each other in a kung-fu movie, and often, neither gets so much as a bruise.

-- If you can grab a rope, or a protruding flagpole, or have a superhero catch you, you will survive a fall even from hundreds of feet above without injury. I was willing to cut the superhero slack--maybe Superman heads downward to cut the relative velocity, but how many times have you seen somebody fall from a height and successfully grab a ledge fifty feet below? Actual end result ought to be two arms hanging there by themselves.

On a related note, when I was a kid, I could never figure out why Steve Austin the Bionic Man didn't end up as a pool of guts with two metal legs standing in it after jumping from a ten-story building.

Don't even get me started about space scenes, or computers in the movies.

An old Arnold film called "Last Action Hero" wasn't all that good, but it did have some fun with the differences between the world of movies and real life.