Field of view and focal length

Started 6 months ago | Questions thread
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777rao Junior Member • Posts: 38
Field of view and focal length

I would like to buy a camera for capturing images from 100metres length with wide range of 3.5metres when camera is placed at 5metres height

My questions would be

How wide is the field of view 100 meters away when the angle of view is known?
Which focal length would you choose?

Could you please let me know how to find the calculations

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