Additional Information on
10.5cm f/2.5 Nikkor-P Auto & 105mm f/2.5 AI Lenses

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Non-Ai 10.5cm f/2.5-22 Nikkor-P Auto Telephoto Lenses

With such a
rich and colourful background occurred during the rangefinder days, it was no surprise that when the reflex F-mount 105mm f/2.5 Nikkor-P Auto lens was eventually introduced in June, 1959, it has instantly became a clear favorite and most Nikon photographer usually have a 105mm telephoto lens in their equipment inventory. The 105mm focal length comes midway between those of 85mm and 135mm and thus, it was very appealing for all round usage during those days. Naturally, the superlative image quality the lens provides was also one of the main reason contributes to its widespread popularity. Compared with normal lenses, this lens has a focal length about twice as long and a picture angle about half as wide. This enables the photographer to take pictures in a more natural perspective, an important factor for photography such as portraiture, a popular topic among amateur photographers.

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Credit: Images of this RF version of this early old 10.5cm Nikkor courtesy of Adorama® Inc. "Ebay - Mathew Duren" <ebay@adorama> Webisite URL:, who also operates a popular Ebay Store. Images Copyright © 2003. All rights reserved.

Go to the Featured Site on RF Nikkor-P section.

But seemingly, its popularity was also attributed on its convenience in lens handling where advantage of direct reflex viewing provided by a SLR camera has opened a new dimension for telephoto lenses where previously using telephoto lenses on rangefinder cameras are tedious and a unassuring process.

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

In fact, most people may not even have aware during those rangefinder photographic days, Nikon has provided not just a single unit, but two Nikkor lenses at this focal length to photographers, a 10.5cm f/2.5 Nikkor-P and
10.5cm f/4.0 Nikkor-T. The optical design of 5 elements in 3 group used in the 10.5cm f/2.5 Nikkor-P was carried forward from the rangefinder days in a revised F-bayonet mount. However, it was not until in 1971-1973, the lens was finally went through a major revision to its optical design where the existing 5 elements in 4 group was used for the first time. On the other hand, the slower speed 10.5cm f/4.0 Nikkor-T was very rare in number because it was only being marketed after the Nikon F was introduced. Information for the lens was scarce but finally, I managed to extract some basic information via Robert Rotoloni's superb references on "Nikon Rangefinder", published by Hove Collectors Book series.

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The single-coated 10.5cm f/4.0 Nikkor-T was in fact, introduced after the reflex Nikon F and a bayonet F mount was also available. Interesting point is its unusual 3 elements optical design.

<<< --- Credit: Images of this rare 105mm f/4.0 courtesy of Mr. Shelton <> . Shelton operates a pupular Ebay Store called "shelton-classics-co", selling many interesting used Photo equipment of various brands. Image copyright © 2003. All rights reserved. Please respect the visual property of the contributing photographer.

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Click on the above thumbnail(s) to see an ENALRGED view. Credit: Images courtesy of Mr. Matthew Lin® <> with an Web URL on his own at: All image(s) copyright © 2004. All rights reserved. Please respect the visual property of the contributing photographer.
Below are a series of additional 7 images of this old Nikkor tele-lense presented by Mr Joseph
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Early Nikkor 105mm telephoto lenses has a distinctively satin chrome finishes. Some versions may also have a black paint finish. However, all of these non-Ai 105mm lenses with the bright chrome ring have been gradually phased out in stages. By 1965, when the first Nikkormat model FT/FS was introduced, many of the original Nikkor 105mm lenses have been updated with newer physical appearance (such process lasted until early '70). Versions such as all matte black finish in exterior appearance also may have been appeared during this period.

Another enthusiastic Nikon user who did not want to be named (but has his e-mail bounced when I sent him a thank you note... please reply to me when you see this site going live as I wish to provide the appropriate credit to you) mailed me an image which indicated there was at least an early version of this lens which has the minimum aperture fixed at f/22 instead of f/32. Further, a red "R" is used to indicate the infrared red focusing index and the distance numerals have not painted in yellow color yet. This version may also has a flat but ridged and textured aperture ring.

Generally, subsequent versions have metallic silver lens barrel and the focusing ring were changed to a deep scalloped design. The aperture ring may have gone through some similar changes as well. The later pre-Ai version usually can be distinguished by a diamond ridged type aperture ring. Most of all, early versions may not be multicoated and they usually have an amber yellowish tint. Generally, I would believed Nikon NIC lens coating process was only being introduced in versions that has the revised optical design which happened mid between 1971-1973. That may has altered colour appearance of its front lens element where those series exhibit a greenish tone.

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Shown at left is an AI-modified 10.5cm f/2.5-22 Auto Nikkor-P lens owned by a good friend of mine who changed his lens to an Ai-Spec after much persuasion from me which reminds me how fast time passes by....

Credit: Copyright-free images collection © 2001, , lens courtesy of Mr. Hong, Ipoh.

Roland Vink has done a fabulous job by painstakingly compiled a list of serial numbers for various possible versions of this evergreen classic telephoto lens. Information published here may be quite useful to broaden your personal knowledge towards the background and history relating to this famed optic. As at 23rd September, 2001, this is what Roland Vink has compiled thus far; although it may not be 100% accurate but you may help to make it better by informing him about your version if it differs from what it has within the compiled lens listing:

A    10.5cm/2.5  tick mark                           120102 - 120106 - 121034 - ?           02/59 - ?       5/3 
A    10.5cm/2.5  Kokagu, plain ring, no screws       ? - 121118 - 152753 - ?                ?     - ?       5/3 
A    105/2.5  Kokagu, plain ring, no screws          ? - 152292 - 166928 - ?                ?     - ?       5/3 
A    105/2.5  Kokagu, scalloped ring, 5 screws       ? - 172151 - 282578 - ?                ?     - 03/71   5/3 

A    105/2.5  Kogaku, scalloped ring, black          407301 - 407528 - ?                    12/70 - ?       5/4 
A    105/2.5  Nikon, scalloped ring, black           ? - 412434 - 471485 - 473834           ?     - 1973    5/4 
C    105/2.5                                         500001 - 507794 - 553157 - 571564      1973  - 03/75   5/4 
K    105/2.5                                         673101 - 690848 - 716560 - ?           09/74 - 1977    5/4 
AI   105/2.5                                         740001 - 740376 - 887328 - ?           1977  - 09/81   5/4 
Ai-S 105/2.5  built-in hood                           890001 -  893583 - 1048549 -          08/81 -         5/4 

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<<< --- Download a PDF file (44k) of the optical construction used in the early Nikkor-P 105mm f/2.5 Auto lens.

Credit: Mr Hong, Ipoh Perak for lending his Nikkormat FT2 and Ai modified 105mm f/2.5 auto Nikkor lens.
Note: I remembered up to early eighties, Nikon was still offering services to modified older Nikkor AUTO lenses to Ai-Spec (in fact, the 105mm lens pictured above was actually an AI-modified version ). Some publications and online resources called these 'AI' Nikkor as 'AI d' - I am not so used to term used and has always wondering who was the genius behind such designation and its true meaning.

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"... This lens is the early NKK Nikkor-p Version Serial No. 208617. It has been machined to allow use on AI series manual focus cameras and the notch index pin has been removed. The glass is in excellent condition, no scratches or flaws. There are no indexing numbers applied to the back rim for finder viewing. The machining isn't the prettiest job, however it works properly. ..."

Credit: The beautiful image of the 105mm f/2.5 lens courtesy of Mr. Michael Korak<> URL: Image of an AI'd 105mm f/2.5 pictured at far left is a copyright-free image © 2001, ,


Early versions: 10.5cm f/2.5-22 Nikkor-P Auto (Info provided by Michael Liu)

Early versions using the revised 5 elements in 4 group design: 105mm f/2.5-22 Nikkor-P Auto

Focal length: 105mm
Maximum aperture: 1:2.5
Lens construction: 5 elements in 4 groups
Picture angle: 23° 20'
Distance scale: Graduated both in meters and feet up to 1 m and 3.5ft
Aperture scale: f/2.5 - f/32
Aperture diaphragm: Fully automatic
Meter coupling prong: Integrated (fully open exposure metering)
Attachment size: 52mm (P=0.75)
Lens Hood: Built-in telescopic type (?) **
: 52mm screw-in
Dimensions: 66mm dia. X 78mm length (2-19/32 in. X 3-1/16 in.)
Weight: 435g (15.3 oz)
Accessories: 52mm Snap-On front cap (108 - 00 - 400), 52mm Snap-On fens hood (108 - 02 -202), rear captype F (108 - 00 - 401), 52mm screw-in lens hood (108 - 02 - 200), leather case CL-9 (108 - 02 - 304), plastic case type L (108 - 02 - 300), flexible pouch No52 (108 - 02 - 302)

* Although it means little since these has been discontinued a long time ago, but just for the record, product Code No. for this lens: 108-02-112; ** I am not sure it does, but the 135mm f2.8 does has a very innovative telescopic lens hood built-in.

Back to | Main Index Page | of Nikkor 105mm Lenses

MF Nikkor Lenses at 105mm focal length : Early non-AI versions | Pre-AI Versions | AI Nikkor105mm f/2.5 | Ai-S Nikkor 105mm f/2.5 | Nikkor105mm f/4.0 UV | Nikkor105mm f/1.8 AI & Ai-S |

Relative: Bellows-Nikkor 105mm f/4.0; UV-Nikkor 105mm f/4.5s, Micro-Nikkor 105mm f/4.0s; Micro-Nikkor 105mm f/2.8s

| Message Board | for your Nikkor Optics in a shared environment
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Nikkor Link.jpg   Special Application lenses:
Micro-Nikkor Lenses - 50mm~55mm -60mm 85mm -105mm 200mm Micro-Zoom 70-180mm
Perspective Control (PC) - 28mm 35mm PC-Micro 85mm
Dedicated Lenses for Nikon F3AF: AF 80mm f/2.8 | AF 200mm f/3.5 EDIF
Depth of Field Control (DC): 105mm 135mm
Medical Nikkor: 120mm 200mm
Reflex-Nikkor Lenses - 500mm 1000mm 2000mm
Others: Noct Nikkor | OP-Nikkor | UV Nikkor 55mm 105mm | Focusing Units | Bellows-Nikkor 105mm 135mm
Nikon Series E Lenses: 28mm35mm50mm100mm135mm | E-Series Zoom lenses: 36~72mm75~150mm70~210mm

MF Zoom-Nikkor Lenses: 25~50mm | 28~45mm | 28~50mm | 28~85mm | 35~70mm | 36~72mm E | 35~85mm | 35~105mm | 35~135mm | 35~200mm | 43~86mm | 50~135mm | 50~300mm | 70~210mm E | 75~150mm E | 80~200mm | 85~250mm | 100~300mm | 180~600mm | 200~400mm | 200~600mm | 360~1200mm | 1200~1700mm

Tele-Converters: TC-1 | TC-2 | TC-200 | TC-201 | TC-300 | TC-301 | TC-14 | TC-14A | TC-14B | TC-14C | TC-14E | TC-16 | TC-16A | TC-20E

Recommended links to understand more technical details related to the Nikkor F-mount and production Serial Number: by: my friend, Rick Oleson by: Hansen, Lars Holst

Recommended Reading Reference on Nikon cameras and Nikkor lenses | about this photographic web site

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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.