Although I’m currently using a 65 macro on a double-bellows setup with PB-6 Nikons, along with extensions to allow the camera to rotate at the rear, my previous setup included an Olympus 20mm/f3.5 screw-in macro with a 5mm-wide front element that didn’t require as much extension and had a dual release on the bellows. Although it stopped down to only f/16, workflow and the images it produced were on a par with the current setup. eugene
