1980 IV-A
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Presumably the A stands for Automatic Exposure control. The Nikonos IV-A is a completely re-designed camera. Using technology from Nikon’s SLR’s, the Nikonos IV-A has automatic exposure control with through-the-lens (TTL), center-weighted exposure metering of aperture-priority. The mechanical shutter was replaced with an electronically controlled one with a speed up to 1/1000 of a second, another improvement from 1/500 on the older models. Camera controls were unified with other Nikon type controls for ease of use. A hinged back was incorporated allowing for ease of loading and unloading, a huge improvement over the previous models where the outer casing was vertically disengaged from the body frame. An LED display for metering and a ready light for flash are incorporated in the view finder.