The Nikonos I, sometimes referred to by its original Calypso name, is a 35mm underwater film camera Nikon introduced in 1963, based on a French design that Nikon licensed and rebadged for global distribution. Built as a sealed body for direct submersion without an external housing, it was positioned for divers, marine researchers and underwater photojournalists.

Auction-hammer evidence for the Nikonos I (Calypso) is thin, with only a single recorded UK saleroom result of £117 in our dataset, so a reliable current-year median cannot be quoted with confidence. Buyers asking what a Nikonos I is worth in 2026 should treat that figure as a historic data point rather than a guide to today's price, and look to completed sales of comparable early Nikonos bodies when judging value.