| NOTE: In an attempt to revamp & rearrange content in this website, there is now a newly developed section featuring various MF Nikkor lenses, please bookmark the new site for future updates. As for SLR bodies, please refer to: - Nikkormat, Nikon EM/FG/FG20, FM series, FE Series, Nikon FA, Nikon F, Nikon F2, Nikon F3 & Nikon F4 |
Specially Designed for Scientific and Industrial Applications
One of the first few Nikkors which used an aspherical lens element.
OP Fisheye-Nikkor 10mm f/5.6
For other up-to-date modern Fisheye lenses, go back to index page for more options.
MUST use with Nikon camera that have mirror Lock up feature, thus a separate focusing device is provided.(Note the rear section of the lens).
Circular picture coverage 180°
Employs unique orthographic projection formula.
When a light source is photographed, the proportion image area of the light source to the total area represents the luminance or brightness of a place. This proportion is called the"Configuration Factor and is often used in civic planning, architectural and fire safety studies.
Subjects of equal brightness reproduced with equal density regardless of their position in the picture, facilitating the use of color films.
Produces a more conspicuous fisheye effect than other fisheyes in that the image reproduced is larger in the center and becomes gradually compressed at the periphery.
Interested take a ride on some old Nikkor fisheye lenses ?
Focal length/Aperture: 10mm f/5.6 Lens construction: 9 elements in 6 groups Picture angle: 180° Diaphragm: Manual Aperture scale: f/5.6~ f/22 on both standard and aperh~re direct readout scale Weight: 400g Dimensions: 84rnm dia. x 105mm long (overall); 74mm extension from flange Filters: Built in; LIA, Y48, Y52, 057, R60, XO Front lens cap: screw-in Lens case: CL-4 (provided)
The first time when I saw this, I have to admit to myself - I didn't know what camera & lens it was. Anyway, Nikon doesn't produce this lens anymore. Please note the extra extension at the rear end of the lens - means it can be only used with cameras that have Mirror-locked-Up function. So, normal viewing is impossible and an separate viewing aid is required. Another point is being, there is no AI indexing (the diaphragm is manual). However, it will still permit variable aperture controlled.
*Note: Finder DF 1 provided.
High rise construction in urban planning is now found throughout the world. Care must be taken to avoid narrow streets thus cutting the level of illumination, both inside and outside high-rise areas. Considerable study must also be given to the effects of radiant heat, generated by fire, on adjacent buildings to give maximum safety to inhabitants. The OP Fisheye-Nikkor lens was designed especially to meet the needs of the urban planner and safety investigator. The lens is used to determine the quantitative luminance of an area or the effects of radiant heat by providing a geometrical configuration of the subject image.
The OP Fisheye as well as the some Fisheye lenses covers an angle of view of 180°. But this lens is designed on an orthographic projection formula, from which the "OP" designation is obtained. Other Nikkor Fisheye lenses are designed on equidistant projection formula.
The construction of the OP Fisheye-Nikkor has been accomplished by use of an aspheric front element to meet the exacting requirements of the orthographic projection formula.
When it is required to measure luminance of a certain area, it is easy to use a photometer. But the data obtained by such measurements cannot be utilized objectively to compare the luminance at different places or to evaluate the illumination of an area because of dependence on season, time and weather. This being the case, it is more convenient to use, instead of the intensity of illumination, the configuration factor. When an area of light is measured in a picture made with the OP Fisheye, it is proportional to the illumination of the plane parallel with the film surface. The configuration factor is the ratio of this area to the total area of the picture.
In other words, the proportion between the total area pictured and the light source is termed the "configuration factor." When the light source is the sky, the configuration factor is called the "sky factor."
In pictures 1 and 2, the sky area to the total area photographed is about 48% and 39% respectively, with the sky (configuration) factors 0.48 and 0.39 respectively. Thus the luminosity of the former is greater than that of the latter.
In a photograph taken with an OP Fisheye-Nikkor, objects of the same luminance are pictured with the same density regardless of their position in the whole picture. This is attained by the orthographic projection formula and is especially useful for measurement of sky light distribution. And even with the use of narrow latitude color film, uniform image brightness over the entire circular field is obtained.
In use with the Nikon F camera, the OP Fisheye-Nikkor lens is mounted after the viewfinder mirror has been placed in the up and locked position. An optical viewfinder with a 160' angle of view is mounted on the camera body accessory shoe for viewing. Six filters are built into the lens in a turret which is rotated easily for the necessary filter.
The lens is fixed focus since its extreme depth of field covers from infinity to one meter even at full aperture.
- Technical explanationsfor this lens are extracted from Nikon Sales Manual 1975 -
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