This is where masking the Lens hood is very helpful, essentially you add a square black mask to the front of the lens hood. It's a technique used particularly with cine camera lenses. I have a Kodak 8mm camera and the lens hood crops tight to the format. You'd need to experiment, use black tape see how close you can crop before the tape impacts the image lens wide open & stopped down.
Somewhere on APUG someone has posted a link to a web-page describing how to do this.
Ian |