Additional Information on
Non-Ai 20mm f/3.5 Nikkor-UD Auto Lens

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Non Ai mount Nikon AUTO Nikkor-UD 20mm f/3.5
Non-Ai 20mm f/3.5 Nikkor-UD Auto

The Non-Ai Nikkor-UD 20mm f/3.5 featured here was Introduced in November, 1967, the concept of optical construction of the lens was entirely new during that era. The lens consists of 11 elements in 9 groups, with back focus 1.87 times longer than the focal length. Thus, the lens can be mounted on the camera with the mirror in normal viewing position. (There is no need to lock up the with the RF converted a F-mount 2.1 cm f/4 Nikkor-O).

Credit: Image courtesy of lesstahnretail-87@EBAY®. The Company also operates a popular Ebay Store where many used RARE pieces of photo equipment cna be found. Images copyright © 2006. All rights reserved. Please respect the visual property of the contributing photographer.

NOTE:- Refer to the Rangefinder Nikkor lenses section for more info

Unlike the 21mm f/4.0 Nikkor-O that was designed to used by both rangefinder and reflex SLRs, the old RF lens needs an external finder for picture composing and the reflex version need a Nikon body that able to mirror lock up feature to operate. Similarly, those applicable Nikon SLRs also require the external finder for picture framing. Most of the time, where you can only make use of the lens' depth of field scales and distance index engraved on the lens barrel/aperture ring to pre-focus while you shoot. However, with its optical nature where extensive depth of field can generate when lens diaphragm is closed down slightly, it should cover a wide range of distances. This is one good advantage of the extremely short focal length which provides profound depth of field and applied well for that old Nikkor 21mm RF converted ultrawide lens.

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Come to think of it, Nikon engineers did a commentary good job with this revised 20mm ultrawide which was designed specifically with Nikon reflex SLRs, the reflex-native 20mm replaced the older version which requires so much time to setup to use and it eliminated the need for mirror lock with any Nikon reflex bodies available that time. On the other hand, the lens was also being designed with a very practical optical formual where common optical abberations such as coma is minimized, thus enabling the lens provides sharp images with good contrast across all its aperture settings. It can also close focus down to 1 ft. and has an optical design of 11 elements in 9 groups (most believed the 'UD' designation was refeering to the 11 lens elements in its design).

Credit: Another fabulous view of the 20mm UD lense by Mr."David Owen" ® Image Copyright © 2003. All rights reserved.

A Mini Showcase of the Auto Nikkor 20mm-UD wideangle lens:-
Non Ai mount Nikon AUTO UD-Nikkor 20mm f/3.5 ultrawideangle lens Non Ai mount Nikon AUTO UD-Nikkor 20mm f/3.5 ultrawideangle lens rear lens mount

Non Ai mount Nikon AUTO UD-Nikkor 20mm f/3.5 ultrawideangle lens rear lens lement section
Despite its relatively slow maximum aperture, the lens has an unusual large filter attachment size of 72mm. This old Nikkor lens was famed for its equal distribution of brightness in the edge areas of the image field that facilitates easy viewing and focusing over the entire focusing screen. Both the aperture and focusing rings are deeply ribbed (the familiar Nikon rubberized grip was not introduced yet). It finishes in black with only the lens mounting ring is chrome finished.

Credit: Image courtesy of lesstahnretail-87@EBAY®. The Company also operates a popular Ebay Store where many used RARE pieces of photo equipment cna be found. Images copyright © 2006. All rights reserved. Please respect the visual property of the contributing photographer.

Credit: Mr. Michael <> from for his kind permission to use images of 20mm lens/cap appeared in this site.
Credit: Mr. Bob Hammond where he wrote" " ..Thought I would send along these photos of a lens hood I have. I believe it is for the Nikkor 20mm F3.5 (UD?), but I use it on a 28mm F4 PC Nikkor. Hope these are of some use to you on your site...".


Like other Nikkor Auto lenses, the UD Auto features an automatic aperture diaphragm and a meter coupling prong. Some early versions uses "Nippon Kogaku while later models reverted back to "Nikon" which give an estimation of its production stage. With exaggerated perspective, this super wideangle lens is quite effective in reproducing various subject matters with striking visual effect. The lens was quite popular in many applications especially suited for architectural photography and for shooting interiors in confined areas. The lens pictured above looks more like a Ai-converted Nikkor with an modified Ai lens coupling system. The lens was eventually being phased out and replaced with a Non-Ai
Nikkor 20mm f4.0 which strangely has a slower lens speed of f/4.0 in 1974 !

Specifications for Nikkor-UD 20mm AUTO 1:3.5 Widenagle Lens:-

20mmf35ud.jpg 20mmf35sml.jpg
Focal length: 20mm
Maximum aperture: 1:3.5
Lens construction: 11 elements in 9 groups
Picture angle: 94° at infinity
Distance scale: Graduated both in meters and feet up to 0.3m and 1 ft

<<<<< --- PDF File (57k)

Aperture scale: f/3.5 - f/22; Aperture diaphragm: Fully automatic
Meter coupling prong: Integrated (fully open exposure metering)
Attachment size: 72mm (P=0.75); Filter: 72mm screw-in
Dimensions: 75mm dia. X 69.5mm length (2-15/1 6 in. X 2-3/4 in.)
Weight: 390g (13.8 oz); Accessories: 72mm screw-in front cap (108 - 02 - 400), rear cap type F (108 - 00 - 401), 72mm screw-in lens hood (108 - 01 - 204), leatherette case (108 - 01 - 301), flexible pouch No. 51 (108 - 00 - 302); Nikon Product Code No. for this lens: 108-01-105;
NOTE: Serial Number was believed to have been started with 421241 for this Non-Ai Nikkor lens

| Back to Main Index Page of Nikkor 20mm ultra-wideangle lenses | Auto-Nikkor 20mm f/3.5 UD | Nikkor Ai & non-Ai 20mm f/4.0 | Nikkor 20mm f/3.5 (Ai & Ai-S) | Nikkor 20mm f/2.8 | AF & AF-D Nikkor Additional info on: 2.1cm f/4.0 Nikkor-O & Rangefinder version of 2.1cm f/4 Nikkor-O

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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.