![]() When Nikon produced the first underwater-only lens (28mm f/3.5), Then, the original 35 mm amphibian lens had approximately the same underwater viewing angle as the 50 mm landlens had on surface. The term comes already from the times of the French camera Calypso (invented by Jean de Wouters), for which Nikon purchased a license in 1963Īnd had begun to produce its Nikonos series. It is necessary to clarify Nikon's nomenclature in the expression “focal length” of underwater lenses. The scheme from the Nikon's original patent The lens we are talking about (and the only one that came into regular production) is the first one. ![]() Another interesting fact is that the patent describes three different lenses: Focal length: ![]() On, at a time when the lens has already been withdrawn from the production line. It should be highlighted that the patent was filed only on, entering in force 5579169) and studied the structure of the lens. Lens from the camera would be particularly awkward as the adapter prevents finger access to the lens release button, which would therefore make it necessary to open the housing back-cover and press the button from behind.įor this reason I decided to tackle the project from the beginning and with a completely new approach.įirst of all, I looked for the Nikon original patent (I've found the US version, which is filed under U.S. This means that some important housing functions would be lost. In the case of SEACAM underwater housing (for D800), zoom gears, manual focus gears, and lens release levers should be removed in order to insert the adapter.Mounting the lens and the adapter is more time consuming and more complicated than the installation of conventional ports.In the case of minorĭefects on the O-ring of the dome port, only a little water would be accumulated at the bottom of the underwater housing and would thus keep the camera dry and undamaged. In the case of minor defects on the O-ring between the adapter and the lens, the adapter would be in a function of a funnel, which means it would be leading water directly to the camera and would consequently destroy it.By adding an adapter to the system, there is a possibility that a hydrostatic pressure could affect a much more delicate modern digital camera and could thereby hinder its operation The Nikonos lenses were designed for rugged underwater cameras.Here, however, I see the following issues: The adaptation of the underwater Nikonos RS R-UW 13mm f2.8 lens to function with modern digital Nikon camera, has already been described in the recent past,īut the solution employed a special adapter which connects three different units to each other: the lens, the camera and the underwater housing. Was astronomically expensive so buyers were scarce and Nikon consequently, already after 4 years, due to economic reasons, withdrew it from its production program in 1996. ![]() Nikon, unfortunately, shows absolutely no interest in producing a digital version of the once famous Nikonos RS, thus making the use of these excellent underwater lenses obsolete. Today, in the era of modern digital cameras, no one considers to use the The underwater Nikonos RS R-UW AF 13mm f2.8 Fisheye lens was, in the days of film cameras, known as the concept of optical excellence in underwater wide-angle photography. Nikonos RS R-UW AF 13mm f2.8 lens – adaptation to modern digital Nikon cameras in a SEACAM housing and review (May 2014)
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