To provide an inexpensive film system equipped with a lens for casual bulb-photographing.

The film system equipped with a lens 2 is constituted of a film unit equipped with a lens 3 and a bulb-photographing device 4. A shutter opening/closing lever 14 integrally formed with a shutter blade projects from a slit 26 formed in the front surface of the film unit equipped with a lens 3. When the film unit 3 is mounted on the bulb-photographing device 4, the lead end part 35a of a sector lever 35 is arranged under the shutter opening/closing lever 14. A shutter releasing time is set by rotating an adjustment dial 38, and the trailing end part 35b of the sector lever 35 is depressed downward. The shutter opening/closing lever 14 is pushed up by the lead end part 35a of the sector lever 35 so as to open a photographing optical path. After a lapse of a set time, the sector lever 35 returns to the initial position, and the photographing optical path is closed.