
Originally Posted by
montrala
I shoot both eyes open. But it does not matter. One eye, both eyes... to shoot you must find "picture" in scope. To find it you must put one of your eyes in position defined by eye relief and exit pupil size (human eye pupil for young eye is about 4mm in day and 7mm in night - you must fit it within exit pupil of scope). The bigger exit pupil, the faster you will see your reticle or aiming dot. When you shoot for long range you usually have time to establish good eye position and find scope picture (in this case exit pupil of scope can be same that eye pupil, this way we can get all the light transmitted to eye without loss). But in CQB you must get there fast and not always you can get ideal, repeatable head position. That is why big exit pupil is critical factor for usability of scope in 1x.
Also, even with both eyes open, narrow field of view of scope generates tunnel vision and hurts awareness. This also can be confusing. On the other hand too much field of view at 1x generates fisheye effect that, while not noticeable with one eye closed, also can become annoying an tiresome for eyes/brain when using both eyes.
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