Nikon Nikonos IV-A (1980–1983)
The Nikonos IV-A was a transitional model in Nikon's underwater line. It was the first Nikonos to need a battery to work and the first to offer automatic exposure. Nikon made it between 1980 and 1983. It is an aperture-priority camera - you pick the f-stop and the body sets the shutter speed - with TTL light metering and a manual-focus, interchangeable-lens Nikonos mount. The standard lens was a Nikkor 35mm f/2.5 prime.
What's documented about this camera comes mostly from marketplace listings, not period journalism or formal reviews.
Beyond that, the record is thin. The sources available give no original price, depth rating, viewfinder specs or battery type. A used example in Europe was listed at approximately €319 - €496 depending on condition, with accessories like fresh batteries, a strap and the original manual. Some listings include obviously wrong accessories (an NP-FZ100 battery, an SD card warning) that belong to a modern digital camera template. Ignore those.
eBay Listings
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