lens_to_camera_mm in telephoto-lens

Hi, I am using mavlink_apriltags_landing_target example with telephoto-lens, but I don’t know the lens_to_camera_mm parameter.
Could you provide some information about that?

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This is the distance from the top of the lens to the camera IC. It changes depending on what you are focusing on. Just get out a ruler and measure from the top of the lens down to about the bottom of the lens mount area.