From Photography in Malaysia
Nikkor 200mm f/4.0 Lenses (AI version)
Nikkor 200mm f2.0 ED IF & 200mm f4.0 lenses (AIS version)
Bjørn Rørslett says (referring to Nikkor 200 mm f/4 Nikkor non-AI, AI, and AIS) "The latest versions (AI & AIS) of this slender, nicely-handling and unobtrusive telephoto are optical gems. It's impressively sharp even wide open and attains peak performance already from f/5.6 onwards. Beyond f/16 the quality gracefully declines. It works great with extension tubes and also with close-up lenses great results can be achieved. As common with true telephoto designs it is susceptible to flare, but ghosting rarely is a problem with it. The AIS version which is the slimmest of the two focuses most smoothly, whilst the AI lens has a markedly stiffer focusing action. They both share the same optical formula, though.
On the D2X, images are stunningly contrasty and sharp at f/4 to f/8, but from there on, detail sharpness starts to decline, contrast gets progressively lower, and chromatic aberration (CA) becomes visible. The amount of CA is not excessive and judicious post-processing can largely eliminate it, but since I foresee situations in which stopping down beyond f/8 is necessary, I have to downrate this nice lens just a fraction for D2X applications."
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