In this mode, the user can adjust the aperture and the camera automatically selects the best shutter speed to match it. In most cameras, the Aperture Priority mode is usually denoted by the letter ‘A'. Most film SLRsA single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured. With twin lens reflex and rangefinder cameras, the viewed image could be significantly different from the final image. When the shutter button is pressed on most SLRs, the mirror flips out of the light path, allowing light to pass through to the film. Other camera typoes include DSLR, Rangefinder and Compact. were made as ApertureThe aperture is basically a hole in the camera’s lens that lets light pass through it to the shutter and ultimately the film or censor. The aperture not only influences picture brightness but also regulates depth of focus. Most cameras are equipped with an iris aperture that can be freely adjusted or set according to pre-selected values. Priority – e.g. Nikon and OlympusOlympus introduced its first camera in 1936, the Semi-Olympus I, fitted with the first Zuiko-branded lens. The first innovative camera series from Olympus was the Pen, launched in 1959. The half-frame format, allowing 72 pictures of 18 × 24 mm format on a standard 36-exposure roll of film, made Pen cameras compact and portable for their time. Pixel More.
