Additional Information on
NON-AI 18mm F/4.0 Nikkor Lens

 
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Non-Ai Nikkor 18mm f/4.0 ultra-wideangle lens

Debuted during Photokina, 1974, this lens with its picture angle of 100° was after the
Nikkor 15mm f/5.6's sweeping view of 110°. But if you compared the lens with the older 15mm lens that was marketed at the same period of time, the 18mm f/4 ultra-wideangle lens is almost a f-stop brighter. It is also less bulky and much lighter in weight in comparison. With its f/4.0 speed, it is not the brightest lens you can find within the Nikkor ultrawide lens group, but this lens has been designed to achieve high image field flatness and to provide sufficient illumination for uniformly sharp, bright images over the entire picture field.

The original 18mm f/4 incorporates a lens construction of 13 elements in 9 groups and its retrofocus design ensures all reflex mirror functions for full aperture operational convenience in open aperture metering. It combines an exceptionally wide picture angle with a relatively compact and lightweight body, thus effectively bridging the gap between the large ultra-wideangle lenses and the more compact standard ultra-wideangle lenses of 20mm and 24mm.

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Because of its extremely wide coverage, those days - this lens was a good solution to those photographers who might need such kind of optic for shooting architectural photography, scenery pictures, snapshots and for shooting in confined areas. The wide front lens barrel was designed to help cut down on unfavorable light reflections from outside the field, while at the same time it also served for mounting the slip-in Nikon Series 9 filters in combination with the lens hood. Thus, this lens is always recommended that the 86mm lens hood always be used while photographing.

The rubberized focusing ring may provide a little clue to its production period as very often, owners of these Non-Ai lenses may convert their optic to an Ai-Spec. Anyway, there is no significant disadvantage compared with the later series introduced as it employs similar optical construction with the later true-Ai version of this lens. Naturally, if ever it has, it is only confined to better compatibility with subsequent Ai Nikon SLR bodies introduced after 1977.

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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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DOWNLOAD a copy of the layout of optical construction in PDF file (80k)

Specifications:

Focal Length: 18mm
Maximum Aperture: f/4.0; Lens Construction: 13 elements in 9 groups
Lens Coating: Multicoated with NIC; Picture Angle: 100
°
Exposure Measurement: via full aperture method; meter coupling prong provided
Distance Scale: Graduated in meters and feet from 0.3m (1ft.) to infinity (
OO); infrared index is provide.
Aperture scale: f/4 - f/22; Aperture diaphragm: Fully automatic
Lens Mount: Nikon bayonet mount; Meter coupling prong: Integrated (fully open exposure metering)
Attachment size: 86mm (P=1); Filter: Series 9 Slip-in Type
Hood: HN-15; Dimensions: 89mm dia. X 58.5mm length (3-1/2 in. X 2-5/6 in.)
Weight: 315g (11.1 oz);
Accessories Supplied: Rear protective cap LF-I (108-00-401); 86mm screw-in front lens cap; 86mm screw-in front lens hood HN-15; hard lens case CL-28 with strap (108-01-302), No.54 Lens Case; Optional Accessories: Seris 9 Slip-in filters

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Nikon Product Code for this discontinued item is No.108-01-131
Content appeared in this section is largely extracted from Nikon Sales Manual, 1974/1976; Note: Starting serial number for this lens was believed to have started from: 173111 for this non-Ai version of the 18mm lens.

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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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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.