Additional Information on
Pre-Ai version of the Nikkor 18mm Ultra-Wideangle Lens

 
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Until the mid '70, the Pre-Ai 18mm f/4 ultrawide remained similar to the earlier version. This lens offers a high flatness of field which also provides sufficient illumination for uniformly sharp and bright images over the entire frame. Data sheet in this page was reproduced from a 1977 Sales Manual and you may use it as a reading reference. This lens still retain similar 13 elements in 9 groups optical construction with the original version.

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It was believed this version introduced has been enhanced with an improved NIC process for air-to-glass lens surfaces to minizes internal reflection and control flares more effectively. This version of the 18mm ultrawide exhibits excellent image contrast which substantially reduced ghost and flare. The 18mm Nikkor offers very wide focusing latitude due to its great depth of field, and its relatively bright maxi mum aperture enhances its usability under con ditions of reduced illumination.

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Download an Optical Construction file in new browser window: 15k Gif

Nikon guide to compatible focusing screen(s) selection and Depth of Field calculation chart for this 18mm Ultra-wideangle lens. Download a file in a new browser window 72k.Gif

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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.