Lens-fitted photo film unit with lens position changing device

A lens-fitted photo film unit that is previously loaded with a photo film, and includes a flash device which emits flash light synchronized with a shutter and a taking lens which forms an image of a subject on said photo film, said lens-fitted photo film unit comprising:

• a flash selection member changeable between an ON position where said flash device is activated and a flash photography is performed with said flash light, and an OFF position where said flash device is inactivated and a daylight photography is performed without using said flash light;
• a lens position changing device for moving said taking lens along an optical axis in response to said flash selection member for setting said taking lens on one of a first lens position and a second lens position, wherein said taking lens is set on said first lens position in said flash photography and said taking lens is set on said second lens position in said daylight photography, such that a distance between said first lens position and said photo film is longer than that between said second lens position and said photo film;
• a stop changing device that selects one of a small stop aperture and a large stop aperture based on a current setting of the flash selection member and a control circuit;
• wherein if the flash selection member is in the OFF position, the control circuit sets said small stop aperture;
• and
• wherein if the flash selection member is in the ON position, the control circuit is constructed to control the aperture by setting the small stop aperture if subject brightness is above a predetermined level, and setting said large stop aperture if said subject brightness is below said predetermined level.