From Nikkor -- The Thousand and One Nights
Tale 20 : Ultra wide angle lens directed for an ultra compactness by OHSHITA, Kouichi
(The tale is about AI 20mm f/4, AI 20mm f/3.5s is also mentioned.)
From Photography in Malaysia
Nikkor 20mm Ultra-wideangle lenses - 20mm f/3.5
Bjørn Rørslett says (referring to Nikkor 20mm f/3.5 AIS) "This tiny lens is extremely well corrected for flare and ghosting; accordingly is the inside tip for nature photographers fond of shooting into the sun (I am one of those). Used in combination with the elusive, ultra-thin K1 extension ring it can give stunning close-ups with a very steep and dramatically emphasised perspective. Although there is no CRC feature, it yields excellent sharpness used up close this way. For landscape work, however, its pronounced field curvature can be a serious disadvantage. The corner sharpness isn't as good as the centre either. I tend to bring it with me just for those dramatic shots into the sun and set the aperture to f/22 to obtain a nice star-shaped sun. Otherwise, f/8 gives the sharpest results."
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