Field of View Calculator
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If you are calculating the camera FOV from the lens focal length using a simple lens model (on the website), there will be differences between the calculation and actual performance. The simple lens model does not include lens distortion and other practical aspects. The 9mm lens on WIC is very close to 9mm in real.
The specified camera distance is too short. It must be be higher than minimal focus length of selected lens .
|Spot size 1×1|
|Spot size 3×3|