Additional Information on
Nikkor 20mm f/2.8 ultra-wideangle lense - Prototype
Reported by Peter Braczko inhis book "Nikon Hand Book"

 
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"Nikon Hand Book" by Peter Braczko (Publisher: Fountain Press) is a very good reference book on Nikon cameras and Nikkor lenses. If you like related topic, this is my personal recommendation for a good, high quality content reference book. He managed to get a press kit distributed during Photokina, 1976 where a picture of a prototype of the Non-Ai Nikkor 20mm f/2.8 lens was enclosed.

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Nikon stated in the press kit that both CRC and NIC was incorporated in this extremely compact 20mm f/2.8 ultra-wideangle lens that actually has small 52mm fllter attachment size and its was far smaller than the last version of the MF Nikkor Ai-S 20mm f/2.8 which has a 62mm filter attachment size ! Further, it has a very complex 14 elements in 9 groupd optical construction and close focus to a minimum distance at 1 foot. It weighs 245g. For some unknown reasons, the proposed lens was never being marketed .

RELATIVE:- Autofocus Nikkor lenses / AF Nikkor 20mm f/2.8s / AF Nikkor 20mm f/2.8D ultrawideangle lenses


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  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:
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

Recommended Reading Reference on Nikon cameras and Nikkor lenses

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