I'm trying to setup a system for automatically framing a camera to a given object. One of the things I'm stuck on is how to adjust the camera's distance from the object when the focal distance and/or aspect ratio and/or aperture's change so that the framing of the object remains effectively the same. Changes to aspect ratio/aperture will of course require compromises in the framing.

Any suggestions?


NOTE: this needs to work in a lops context.

NOTE: I have posted another question with similar but different goals (link below). I expect that the solutions for these two scenarios may have some overlapping features.

https://www.sidefx.com/forum/topic/95627/?page=1#post-420362 [www.sidefx.com]