Main article: Single-lens reflex camera. When vertical lines in the object being photographed meet exactly in the combined image, the object is in focus. The user will guess or calculate the distance to the subject and adjust the focus accordingly. The shutter is opened, light enters the camera and exposes the film or sensor to light, and then the shutter closes. Main article: Subminiature camera. Rangefinder cameras allow the distance to objects to be measured by means of a coupled parallax unit on top of the camera, allowing the focus to be set with accuracy. The first camera using digital electronics to capture and store images was developed by Kodak engineer Steven Sasson in Main article: Medium-format. Ascher, Steven; Pincus, Edward
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