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Some day try looking through a telescope eyepiece that's 2mm. That's when you appreciate eye relief.

Well, it's a relationship between the initial lens and the final lens. it's about ease in being able to see the field of view. it's a convenience thing really but I like my definition better-har har....

Zeiss is THE preeminent name in optics of all kinds and folks will pay a kings ransom for especially the older stuff from WWll era.

"Eye relief is the distance from the outer surface of the eyepiece lens to the position where the exit pupil is formed (eyepoint). Looking through binoculars from the eyepoint, you can obtain the...

Having a large exit pupil is about eye relief. If you wear glasses you will realize that.

Most binos come in just a few ranges. 7x50 are considered marine glasses and always have been while 8x30...

Of course they sell binos for astronomical viewing. Check Meade and celestron and you'll see these huge monsters usually mounted in a frame and you sit in a chair while viewing. Most discoveries...

Way way back they used "spyglasses" monoculars which had good mag and tiny fields of view but before or around WWl they were being replaced with Binos already.

The field of view would give the purpose away. Opera glasses have a very small field of view to zoom in on a single performer on stage. Opera glasses would be useless in the field. Even birding...

yea that size probably opera glasses

Stop and think for a moment how similar binos are to razors. Instead of grinding steel you are grinding glass of varying qualities and like polishing the steel you are polishing the glass and just...

The bottom line is when you look through a pair of real quality binos (and the same applies to all optics whether microscope, telescope, binos or hand lens) the appliance you are using essentially...

I have the same model as you but mine are from the early 70s with a 585 thousand serial number. Your's are way better than mine. Mine just says Nikon and those were degraded the same as when they...