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Nikonos 4A s/n 4198433
The underwater Nikonos IVA has gone through some major improvement to the Nikonos design. This is not surprising as the Nikon SLRs have also been been greatly improved on all other aspects. One of the most significant development was the inclusion of auto exposure (the "A" behind the IV signifies auto-exposure), extended film speed range which is now 25 to 1600 ISO as well as at the flash photography section. The shutter was still deploying a vertical traveled, metal focal plane type with working shutter speeds improved slightly from 1/30 sec to 1/1000 sec. (and Bulb) + a backup mechanical shutter speed at 1/90 sec (M setting), should the battery fails or situation when facing with power depletion. Flash synchronization: Cable connection with adapter for electronic flash synch also has been improved to 1/90 sec (Automatic flash control with Nikonos electronic flash units). It weighs heavier than its predecessor at 900g. It was also the first Nikonos that incorporated with a built-in light sensor and offer an aperture priority exposure control. Other improvements included are a side-hinged back cover, rapid film advance lever, an Albada-type viewfinder with an easy to read, bright LEDs display as well as a flash ready light inside the finder. Initial production serial that can be traced was believed to be from 410xxxx and the IVA was discontinued in 1984.
