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Question on how FoV is calculated

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/18/2010 at 15:35
tpcollins View Drop Down
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I was looking thru my binocs today and noticed something so I made a test.  So I rested them on a stepladder , closed my right eye and saw a specific width on a building with my left eye. Then I closed my left eye and did the same thing with my right eye. I saw the same amount of width but a different portion of the building - a few feet further to the right than the view I saw with my left eye. When I looked with both eyes, I saw the "combined" width of the two singular views - and I never moved them while on the ladder.
 
My Zeiss is rated at 405' at 1000 yards - is this with one side or the combined view of both sides? Thanks. 


Edited by tpcollins - May/18/2010 at 15:37
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/18/2010 at 15:44
jonoMT View Drop Down
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If the FOV is rated at 405 @ 1000, then it should be ~ 40% of whatever distance you are from an object being viewed. Maybe you could measure 40 feet on the side of a building and then measure a distance 100 feet away. That would give you an empirical answer.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/18/2010 at 16:26
tpcollins View Drop Down
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My math works out a bit less than 40%.  1000 yards is 3000 feet - 405' / 3000' = 13.5%.  Or am I missing something?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/19/2010 at 22:28
jonoMT View Drop Down
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You're quite right. My mistake...I completely glossed over the yards vs. feet aspect of it. So 13.5:100 units of whatever is your ratio. 
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