Nikon Nikonos-III Underwater Camera with 35mm F2.5 Lens
This Nikonos shows normal signs of use. Check photos for condition.
Nikonos-III SN: 3166926
Nikkor 35mm f/2.5 SN: 375493
The Nikonos III underwater camera from Nikon succeeded the Nikonos II in 1975. This version added a bright-line viewfinder as well as sprocket-gear frame spacing (which had been missing from prior Nikonos models). This would be the final model derived from the original French Calypso design inspired by Jacques-Yves Cousteau, although with a slight increase in body size. Its purely mechanical design gives it a reputation for robust reliability.
The standard lens is a Nikkor 35mm f/2.5 with zone focusing and a useful depth of field scale. The version available alongside the Nikonos III has its aperture knob anodized black. Water's higher refractive index affects the behavior of optics: when submerged, the 35/2.5 yields a field of view equivalent to a ~47mm lens on land. The protective planar glass front of the f/2.5 lens permits its use both above and below the surface, which is not true of some of the more specialized underwater-Nikkor lenses.