Okay, so first of all I'm not really an expert when it comes to optics,

but I have a small project where I would like to simulate how the behavior would change if I apply a different lens on the ToF-camera.

So from what I have read I understood that there is an emitting angle at which the camera sends out light and a receiver, which should at least have the same or bigger angle than the emitting side (called Field of View).

So first question. If change the size of the Field of View, I would need to adjust for that on the receiving AND the emitting side, right?

Now to my second much broader question. If I define that my current Field of View is 25° and I would like to simulate a FoV of 50°, what properties would I need to consider? Since the surface which gets illuminated is much bigger the illumniation at one specific point should be a lot smaller. Is there a formula, with which I could calculate the difference (for one point and the whole surface)?

If the illumination on the emitting side is a lot smaller, how would I adjust for that on the receiving side? The light, that is reflected from the surface should now also be a lot less. Is there a possibility that I get wrong distance measurements because of that?

Some links or pictures to describe the changes would of course be a really helpful. I didn't really find anything specific for time of flight cameras.

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