u/NDK_yt

The bokeh node that comes with Nuke and a lot of gizmos used for defocusing uses real lens and camera values(f/stop, focal length, focus distance and sensor size) to calculate the defocus. My question is that in the sensor size knob do we enter the actual size of the camera’s sensor or the image circle size of the lens that was used?

In my mind when shooting with a real camera and lens the level of defocus shouldn’t change when mounting the lens on a full frame camera compare to when we mount it to a camera with a smaller sensor size, the only difference should be that the latter have a smaller fov/a bit zoomed in. So shouldn’t we input the size of the image circle of the lens instead? Or am i just thinking about this all wrong?