I was trying to model a simple camera obscura in sequential mode.

I wanted to check the airy disk depending on the size of the pinhole. The pinhole was simply defined by the semi diameter of the stop surface.

The simulation worked correct but I became a bit confused since the airy disk was not affected when I changed the distance between stop surface and image plane.

The only distance which affected the size of the airy disk was the distance between object and image plane which doesn’t make sense.

Thanks for your help!