Approximate Focal Length for Webcams and Cell Phone Cameras Satya Mallick June 17, 2016 22 Comments 4 min read Share Tutorial June 17, 2016 By 22 Comments In this post I will explain how to find a crude approximation to the focal length of a webcam or cell phone camera ( i.e. fixed focal length cameras ) if calibration is not an option or if you are too ... Read More →