Nikkor Telephoto 300mm f/4.5 non-AI, AI ED, 1975-1978
After the introduction of the 180-600f/8 ED, Nikon began to integrate ED glass into some of its proven designs. ED glass is designated for its property of Extra-Low Dispersion, which refers to the fact that the index of refraction is nearly constant over the visible wavelengths of light.
In conventional glass designs, the index of refraction generally varies for different wavelengths; thus, the sharpness of distant images may be adversely affected by the misconvergence of different colors. In fact, for very long focal lengths of over 300mm or so, it is impossible to perfectly converge all visible wavelengths on the same spot; generally, lens designs up to the 1970's all tried to converge red and blue on the same spot, which would leave green and purple fringes. All of this changed when Canon and Minolta began to demonstrate lenses with artificially-grown calcium fluoride elements in the early 70's. CaF elements have a constant index of refraction over visible wavelengths, and it is thus possible to design long lenses with perfect convergence. Not to be outdone, several years later, Nikon introduced ED glass, the exact formula of which is unknown. It is believed that ED is a fluorocrown glass, which means that fluorite has been added somehow to conventional optical (crown) glass. Although ED glass does not perfectly correct misconvergence, it has several advantages over fluorite elements, including being physically harder (CaF is fairly soft and thus cannot be used as the front element) and less sensitive to the environment. Thus ED glass has actually proved to be more practical than fluorite elements (and indeed, Canon seems to have switched to what they term Low Dispersion glass in their latest designs). In particular, this lens is of six element/five group construction, with the front element being the only ED element, again similar to the AI and AI-S ED 180f/2.8. I have never actually seen this lens, but its physical design presumably parallels that of the regular 300f/4.5 (e.g. it has two tripod sockets on the non-AI and a single rotating collar with AI version).
The photo of a non-IF ED 300 (At the top section of this page), which is reputedly the best Nikkor 300 ever available.
This lens has the best reputation that I've heard of for Nikkor 300's. Chasseur d'Images gave it an amazing rating, and David Reuther's Subjective Lens Evaluations concurs with them. This, coupled with its relative rarity, have made this lens more of a collector's item than a user's delight. If you really want the ED glass, I would recommend the IF-ED version. Although it may not enjoy the same sterling reputation (though an excellent lens in its own right) as the ED version, it has the added benefit of internal focusing, which makes it shockingly light and easy to handle, as well as a closer-focusing capability.
Previous | Next |
Revised website | Nikkor Resources | New Upload
| 1964-1977 | 1975-1978 | 1977-1990 | 1979-1989 | 1987-present |
Back to Main Index Page
| Nikon | Nikkors - Michael Liu's Oriental Nest
Back to Special Lenses Section
Nikon F | Nikon F2 | Nikon F3 | Nikon F4 | Nikon F5 | Nikon F6 | Nikkormat / Nikomat | Nikon FM | Nikon FE/ FA | Nikon EM/FG/FG20 | Nikon Digital SLRs | Nikon - Other models
Nikon Auto Focus Nikkor lenses:- Main Index Page
Nikon Manual Focus Nikkor lenses:- Fisheye-Nikkor Lenses - Circular | Full Frame | Ultrawides Lenses - 13mm15mm18mm20mm | Wideangle Lenses - 24mm28mm35mm | Standard Lenses - 45mm 50mm 58mm | Telephoto Lenses - 85mm105mm135mm180mm & 200mm | Super-Telephoto Lenses - 300mm 400mm 500mm 600mm 800mm 1200mm |
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
| Message Board | for Nikon F Series SLR Camera(s)
| Message Board | for your Nikon Optics in a shared environment
| Message Board | Specifically for Dispose or Looking for Nikon/Nikkor Photographic Equipment
Home - Photography in Malaysia
Web Content Copyright © 1999. Michael Liu ®. Made with a PowerMac,