Electronic device depth camera systems having a reduced number of outwardly-facing optical components are disclosed. Monocular depth camera systems, including basic depth camera systems as well as RGB-D camera systems, have exactly one window on a housing panel of the device through which light is transmittable out of and into the device housing. An optical emitter and detector(s) are located within the device housing. Binocular RGB-D camera systems have exactly two outwardly-facing optical components on the housing panel. One of the components, such as an optical emitter or an exit window, is associated with illumination light leaving the device, and the other optical component is an entrance window associated with transmitting detection light into the housing.