The Olympus-35 EC is an electronic controlled 35mm compact camera introduced in 1969. It features a fixed Zuiko 42mm f/2.8 lens comprised of 5 elements in 4 groups. It takes 43.5mm filters. The electronic shutter is a Seiko ESF and is automatically controlled and cocked with the press of the shutter release. It has a shutter speed range of 4 seconds to 1/800 of a second. There is two indicator lights for the camera. There is a yellow light on top of the camera as well as in the viewfinder. This acts as a battery check feature with a half press of the shutter release. It will also briefly light as a slow shutter warning when speeds are 4 seconds to 1/30 of a second. A blue light in the finder will appear when a flash is mounted and required to take proper exposures. The blue light will not emit if there is sufficient light. A shutter lock feature is on the face of the camera to prevent unwanted exposures or meter readings. There is an accessory shoe, on the top plate as well as a ¼” 20 thread tripod socket on the base. Flash is possible with 1/20 of a second flash sync and connects via a PC terminal on the left hand side of the camera. The flash guide number can be set on the lens with the ring closest to the camera body. The exposure meter is based on a CdS cell. The film speed can be set on the top plate of the camera with a range of 25 to 800 ASA. Focusing is done on the lens collar. It uses a zone focus system with a range of 1m to infinity. There are focus stops for 1m, 1.5m, 3m and infinity. They are also represented in the viewfinder by iconography of a person’s face, portrait, and group and mountains. The film transport has an auto resetting counter, uses a manual right thumb wheel for advancing the film, and a rewind crank is on the base of the camera. The exposure system and shutter is powered by 2 mercury PX640 batteries no longer available but replaced by the A640PX alkaline battery. Information from Camera-wiki.org.