Additional Information on
Fisheye-Nikkor lenses

 

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Fisheye lenses and their Optical Properties

This is one single territory where Nikon can truly claimed an originator and still holds a technological advantage over other camera/lens manufacturers. Many people would unhesitatingly acknowledge Nikon's untiring effort in pioneering many innovation and development of ultra-wideangles, close focusing optic, tele and zoom lens technologies. Creative conversion of Fisheye lenses for 35mm photography was another Nikon pioneered optical application. The first fisheye lens designed by Nikon was a 1962's
Fisheye Nikkor 8mm f/8.0 fixed focus lens. The current model is an AF-D Fisheye-Nikkor 16mm f/2.8D and a Manual Focus Fisheye-Nikkor 8mm f/2.8 Fisheye-Nikkor lens as regular production optic.

Credit: Image was acquired by scanning from Nikon's 1982 publication, "Eyes of Nikon".

Nikon has more than seven fisheyes lenses in total, each with varying lens speed, features, technical specifications and lens type for different kind of photographic applications. Generally, you can safely classified them into a two main catagories: Full frame Fisheye or Circular Fisheye lenses. Next, whether if the version you owned requires a Mirror-Lock Up feature inside camera in order it to be used or don't. Original series of fisheye lenses were slow in their maximum aperture and have fixed focus design, the slow lens speed may make photo composition inside camera viewfinder difficult. Generally, they would also require a mirror-lock up mechanism on the camera section in order to avoid the extended protruded back portion of these lenses interfering with the reflex mirror movement during an exposure process. Naturally, lenses of this design need auxiliary finder to provide visual aid for composing but focusing is via predetermine distance and make use of depth of field scale engraved on the lens barrel. Subsequent replacement of Fisheye Nikkor lenses that emerged have much better design and equipped with a brighter maximum aperture to enable easy, bright picture viewing/composing. More importantly, they were being designed as a reflex optic for SLR (retrofocus lens) which means truthful, nonreverted reflex viewing is possible with any working SLR camera. Further, there is no neccessity to utilize Mirror-Lock to enable these lenses to be used onto any Nikon SLRs. Naturally, the newer series of these Fisheye-Nikkor lenses are believed to have a much improved optical performance when compared to older series in areas such as close focusing ability, lens coating process and maximum les speed etc.

FM2/T 16mm Fisheye Lens.jpg
Originally designed for scientific studies, fisheye lenses were once called "full sky lens". It was primarily used for astrophotography and astronomical observations. Today, however, the fisheye lens is widely used by professional photographers, researchers and even many serious amateurs when special wide filed effects are desiredin their images. Imaginative use of the various optical characteristic of a fisheye lens can create a world of mystery from the most conventional subject matter.

A latest AF-D Nikkor 16mm f/2.8 lens mounted on a Nikon FM2n/T camera. Copyright-FREE images collection © 2001 

Looking through the viewfinder of a camera equipped with a fisheye lens can be quite an experience. You see everything from the ground at your feet (Some lenses even have your feet covered in, too), to the sky overhead and virtually everything to your right and left within a radius of either 220 -180° depends on the lens type. All the images in the viewfinder produced by such lens type are circular in the middle of the picture frame and that's the way it will be reproduced on film (Except the
16mm fisheye which is a full frame fisheye lens that will generate an image that will fill up the entire 24mm x 36mm picture frame). The fisheye lens' view is like that of a fish looking through the water to the surface as shown in the illustration below. Because of the refraction between water and air the fish has a tremendously wide angle of view. The front element of a fisheye lens has an extreme amount of curvature which accounts for its 180° vision. All these lenses (Except full frame fisheye) have a built-in filter turret and they will project a circular fisheye image in the center of the picture.

fisheyeillus.gif
The large, concave lens in front covers the subject area and then bends the light into approximately a 90° cone. The convex lens at the rear then forms the image on film. The same degree of coverage in a conventionally designed lens would require a much larger image area. Instead, with this lens, a limited circular image is projected on film. Due to the small image area, straight lines are rendered in a barrel or arch shape.

My Fisheye lens.jpg User Manual for 6mm Nikkor Fisheye lens
<<< --- The current version of AF-D Fisheye-Nikkor 16mm f/2.8 Copyright-FREE images collection © 2001 

Fisheyes are different from ultra-wideangle lenses, since their most obvious feature is perspective distortion that caused the bending of straight lines, especially those near the edges of the frame. Other factors are the exceptional depth of field and stretched out perspective.

<<<--- Instruction Manual for 6mm Nikkor Fisheye lens

Nikkor Circular Fisheye Lenses: 6mm - f/2.8 | f/5.6 | 7.5mm f/5.6 | 8mm - f/2.8 | f/8.0 | 10mm OP f/5.6 |
Full frame 16mm Nikkor-Fisheye Lenses - f/3.5 Non-Ai - f/3.5/f/2.8 Ai - f/2.8 Ai-S - f/2.8 AF-D

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Recommended links to understand more technical details related to the Nikkor F-mount and production Serial Number:
http://rick_oleson.tripod.com/index-153.html by: my friend, Rick Oleson
http://www.zi.ku.dk/personal/lhhansen/photo/fmount.htm by: Hansen, Lars Holst
http://www.mir.com.my/rb/photography/hardwares/nikonfmount/lens2.htm
http://www.photosynthesis.co.nz/nikon/serialno.html

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leofoo.Gif Co-developed with my web buddy, Rick Oleson® & LARs.Gif Denmark, Creator of the Nikon Repair Group Mailing-List; A contributing effort to Michael Liu's Classic Nikon SLRs and Nikkor optic site.

Credit: MCLau®, who has helped to rewrite some of the content appeared this site. Chuck Hester® who has been helping me all along with the development of all these Nikon websites; Lars Holst Hansen, 'Hawkeye' who shares the same passion I have; Ms Rissa, Sales manager from Nikon Corporation Malaysia for granting permission to use some of the official content; Ted Wengelaar, Holland who has helped to provide many useful input relating to older Nikkor lenses; Some of the references on production serial numbers used in this site were extracted from Roland Vink's website; Hiura Shinsaku from Nikomat Club Japan. Lastly, to all the good people who has contributed their own expeience, resources or kind enough granted permission to use their images of their respective optic in this site. It is also a site to remember a long lost friend on the Net. Note:certain content and images appeared in this site were either scanned from official marketing leaflets & brochures published by Nikon and/or contribution from surfers who claimed originality of their work for educational purposes. The creator of the site will not be responsible for may discrepancies arise from such dispute except rectifying them after verification. "Nikon", "Nikkormat", "Nippon Kokagu KK" & "Nikkor" are registered tradename of Nikon Corporation Inc., Japan. Site made with an Apple IMac.