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Question on how FoV is calculated

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Category: Other Optics
Forum Name: Binoculars
Forum Description: Anything that requires two eyes to look through it
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Topic: Question on how FoV is calculated
Posted By: tpcollins
Subject: Question on how FoV is calculated
Date Posted: May/18/2010 at 15:35
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. 



Replies:
Posted By: jonoMT
Date Posted: May/18/2010 at 15:44
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.

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Posted By: tpcollins
Date Posted: May/18/2010 at 16:26
My math works out a bit less than 40%.  1000 yards is 3000 feet - 405' / 3000' = 13.5%.  Or am I missing something?


Posted By: jonoMT
Date Posted: May/19/2010 at 22:28
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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Reaction time is a factor...



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