The Kodak Instamatic X-45 is a camera for Kodapak type No. 126 film cartridges. It was made by Kodak in the USA and introduced into the Instamatic range in July 1970. As a film advance mechanism it has a wind-up clockwork motor. This has to be turned two or three times; then a handful of exposures can be made until the mechanics need a new wind-up. The camera has a unique CdS-meter controlled aperture mechanism: It finds the right aperture by moving a set of different apertures over the CdS-sensor window. When the electronics recognizes sufficient light on the sensor, the right aperture is also set behind the camera lens (see also link to merrillphoto.com).