In the field of industrial inspection, choosing the right lens focal length is crucial. Don’t worry about the complicated calculation process. This article will teach you how to quickly determine the lens focal length through a simple formula.
* Friends who are not convenient to watch the video can learn more through the following text introduction.
As long as you know the distance from the object to the lens (object distance) and the distance from the lens to the image plane (image distance), you can easily calculate the required focal length using the formula 1/focal length = 1/object distance + 1/image distance.
For example, when the object is 200 mm from the lens and the image distance is 50 mm, the focal length of the lens you need is 40 mm. In short, find the "balance point" between these two distances and you will get the ideal focal length value.
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2025-02-25
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