stoneinapond
Veteran
McI thought I needed less then 14.
I'm not sure I fully understand "less than". Do you mean wider? If that is the case you are going the wrong way from where you want to be.
There are several interview framing conventions. There is the full face, half body shot, full body, and then as mbob states, the environmental shot that can include more of the space or the interviewer and interviewee. In that order you either move the camera from in close to further away, or from a fixed position you would zoom from a long focal length down to a wide length. Not that you would necessarily use these lengths but for illustration purposes with the zoom lens, you would go from 140mm down to 14mm.