25mm Lens for ds-2cd2032-i Mini-Bullet

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Young grasshopper
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Hello everyone,there is a small experience to calculate the relationship between the lens and distance as well as span.
4.8/25mm * far = width, for example 4.8 / 25mm x 50 m =9.6 meters, then 25 mm lens, at a distance of 50 meters of the position, the left and right sides of the actual width is 9.6 meters.
Hope this formula for all of you to help.:D
 
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