 A selenium-cell powered light meter was cheaper in production and did not need a battery.However, the much smaller CdS-photoresistor improved the stylish look of the camera, the battery powered light-meter was more shock-resistant, and the "CdS technology" could be used as a selling point in advertising.The housing needed to be changed just slightly, since Waaske unknowingly had adopted the appearance of Rollei's twin-lens reflex cameras, by placing the exposure time and aperture controls to the right and to the left side of the lens.