I am currently struggling with some lens equations. I hope this is the right place to ask such questions.
What I'm trying to accomplish is to add a separate single lens to a camera setup and calculate the new focus plane (See the added image).
To calculate the new focus plane I am assuming the 16 mm Kowa lens (on the camera) to behave like a thin 16 mm lens. Using simple lens equations, I then calculate how adding the separate lens would shift the focal plane.
However, the results I get from these calculations do not correspond to what I see in my experimental setup.
What am I doing wrong? Does substituting the Kowa lens for a thin 16 mm lens in my calculations make that much of a difference? If so, how could I calculate this without knowing exactly what is inside of the Kowa lens?
Writing out my calculations here would make this a wall of text, so I left them out. If they are required though, I would be happy to add them.