B&L Automatic Shutter

Bausch & Lomb Automat image by SBA73 (Image rights)

Bausch & Lomb's Automatic shutter was still one with pneumatic controls, with one cylinder to connect a bulb's flexible tube, the other to regulate speed. It included a diaphragm and a shutter release lever. It fitted two-part screw-mount lens kits.

image by Mario Groleau (Image rights)