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Question on how FoV is calculated |
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tpcollins
Optics Journeyman Joined: January/12/2009 Status: Offline Points: 428 |
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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. Edited by tpcollins - May/18/2010 at 15:37 |
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jonoMT
Optics Master Extraordinaire Joined: November/13/2008 Location: Montana Status: Offline Points: 4853 |
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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.
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Reaction time is a factor...
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tpcollins
Optics Journeyman Joined: January/12/2009 Status: Offline Points: 428 |
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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?
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jonoMT
Optics Master Extraordinaire Joined: November/13/2008 Location: Montana Status: Offline Points: 4853 |
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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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Reaction time is a factor...
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