If you have a 4K camera with a 5mm lens; Is there a way to calculate the digital zoom of the camera? I know I need to get the 4K camera to zoom into an area of 52' wide and 800' away.
4K Digital Zoom To 800ft
You are going to get ~5ppf with a 4K camera, 5mm focal length at a distance of 800 feet away.
See this calculation for it on a map. It will probably be something like a 16x digital zoom and the quality will be pretty terrible. IF you need to see something that far away, you will need to use a longer lens.
let us know if we can help.
Eric,
Be sure to decide if you really want Digital Zoom or Optical. They are very different.
The IPVM article that discusses this is HERE .
Hello Eric,
An area of 52' wide at a distance on 800' requires a horizontal field of view of just 3.72°
It's impossible to say exactly what angle of view your 5mm lens will produce without knowing more details about the lens and the imager, but I suspect a 5mm lens will produce a wide angle, of say 75° (this is an estimation)
On a distance of 800', the lens will cover a horizontal area of ~1200'
With your 4000 x 3000 pixel 4K camera, you have 4000 pixels horizontally.
In a scene of 1200' wide, that is 3.3 pixel/foot.
For your scene, with digital zooming you have about 172 pixels available for your schene on 52'
With an aspect ratio of 4:3, your image will be a 129 x 172 pixels one.
Needless to say that this will be a very disappointing result.
You have a wider angle lens, but you really need a tele-lens.
Hope this helps,
Henk Heijmink
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