Abstract: Optical systems for use in digital cameras are provided. The systems can be switched between three optical paths (1,2,3): a first path (1) for through-the-lens (TTL) viewing; a second path (2) for recalling previously taken pictures from a microdisplay (16); and a third path (3) in which pictures are taken using an electronic sensor (15), e.g., a CMOS sensor. The optical systems employ a zoom objective lens unit (10), e.g., a 3:1 zoom, an erector lens unit (12), and an eye lens unit (13). They can also employ an image size adjusting lens unit (11) for equalizing the TTL and recalled images presented to the user.

Abstract: A compact through-the-lens digital camera comprising an objective lens unit, an image sensing device, an internal display device, an eye lens unit, an optical system, control and processing circuitry, function select controls, and an external interface. The optical system is switchable between an image framing mode optical path, wherein light is directed from the objective lens unit to the eye lens unit, an image capture mode optical path, wherein light is directed from the objective lens unit to the image sensing device, and an image review mode optical path, wherein light is directed from the display device to the eye lens unit.