This roll film holder has a film speed dial with ISO settings from 25 to 6400 which automatically interfaces through the AE prism finder with the camera shutter and lens diaphragm to assure correct exposures. The dark slide is locked when roll film holder is not attached to camera to prevent accidental exposure The shutter cannot be released when this roll film holder is attached to camera, unless the dark slide is withdrawn

• Roll film holder accepts a 120 or 220 film insert
• Has a built-in dark slide storage holder slot