Nikon Nikkor Fisheye 7.5mm User manual

FISHEYE
                                www.butkus.us NIKKOR
7.5mm f5.6 ultra wide angle lens

FISHEYE NIKKOR LENS
    7.5mm f5.6 180" coverage





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                                  Date: 2019.10.16 19:57:57 -04'00'butkus





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   The idea of a lens with a 180o picture angle seem$
    almost incredible, except that the Fisheye Nikkor
    achieves just that-and more-with amazing image
     resolution and color correction.
    In fact, the term picture angle is not entirely applicable.
    For it is generally used to describe the angle subtended
   by the diagonal of the film (its longest proportion),  .(
    whereas the coverage of the Fisheye Nikkor is in no way
     limited by the format of the film.

   hemispherical coverag€ The Fisheye Nikkor
     actually 'sees' a full 180" hemisphere: everything in front,
    above, below, to either side - all around. And it records     this hemisphere on the film as a circular image 23mm in
    diameter.
  sOme of the applications Apart from the
    unusual, spectacular pictorial effects obtainable with this
     lens, its capabilities have found many valuable scienffic
    and industrial applications. fn meteorology, for example,
     it can be used to record cloud distribution patterns in

the entire sky canopy. It can also be used to measure
 zenith and azimuth angles of astronomical bodies.
In industry, the Fisheye has provided recorded observa-
tion of boiler interiors, oil lines, sewer conduits, cylinder
bores, and other constricted enclosures which must be
shown in their entirety.                              www.butkus.us
The Fisheye has also been used for surveillance, for
automatic time studies of customer movement and con-
centration in large retail stores, for sports action and
architectural photos, etc. The scope of applications  is
almost unlimited.
                                                   Cloud study for meteorology





fits Nikon F and Nikkormat FT rn" Fisheye
Nikkor7.Smm f5.6 can be used on both the Nikon F and
Nikkormat FT. Because of the physical depth of this lens,
the camera mirror must be locked in oup' position, thus
making the reflex finder inoperative. Instead, a L60" opti-
cal finder, furnished with the lens, is mounted on the
camera, and used for viewing.
Note: When used with a Photomic-equipped Nikon F,
the Photomic system must be removed.
fOCUSing There is no need nor provision for
focusing because of the extreme depth-of-field of the
lens (20 inches to infinity at full aperture). And because
of its extreme angle, it cannot be used with a lens hood.

built-in fifterS The Fisheye Nikkor has 6 built-in
 filters mounted on a turret (see srrcIFIcArIoNs). The
 desired filter is brought into the optical path of the lens
 by rotating the external Filter Selector dial until the
 desired filter designation, engraved on the rim of the
 dial, appears opposite the pointer.
 filter table
                             DaylightExposure IncreaseTungsten
 Skylight (LIA)                    none            none
 Medium Yellow (Y48)             l.7x             r.2x
 Deep Yellow (Y52)              2X            1.5X
 Orange (O57)                  3X            2.5X
 Red (R60)                    6X
 Light Green (X 0)               2X            r.7x
 NOTE: Filter LIA is for color or black & white film; the remainder
 are for black & white only. Filter factors are approximate (depending
 upon specific color sensitivity curve of film) but apply generally to
 panchromatic emulsions: ASA 100.





Filter Designation



    Filter Index





     Fisheye Nikkor specifications
       focal length.' 7.5mm
      picture angle: 180"
      construction: l0 elements, 7 groups
     aperture scale: f5.6 to f22 (clickstops)
          mount: bayonet (Nikon F)
        picture size: 23mmin diameter
          focusing: fixed
      depth-of-field: 20 inches to infinity at full aperture
               filters: six (see FILTER TABLE) built-in on
                     rotating turret
        viewfinder: optical; 160' angle
       dimensions.' length, 44.2mm (from front of camera);
                    diameter, 82mm
          weight: lZV+ sv. (350 g)
         Nikon Incorporated
                   Garden City, New York 11533
          Subsidiary of Ehrenreich Photo-Optical  Industries, Inc.
                                                     PRINTED IN U,S.A.