Feticisti delle ottiche Nikkor / Nikon AI-s - parte 2

“ Sarebbe interessante se qualcuno avesse la possibilità di mostrare le reali differenze tra un 180 ai-s ED e un af, vedo che dai dati anche quando era in produzione l'af il modello manuale ha continuato ad essere prodotto in parallelo, il manuale dal 81 fino al 2005 gli af e la prima sfornata del D dal 86 fino al 2005. „

“ 180mm AIS ED
This fast medium telephoto lens has, thanks to its ED element and modern optical formula, a superb optical quality. Images are rendered with high sharpness, contrast and vivid colour saturation. Even wide open quality images are produced, and stopped down to f/5.6 it's hardly possible to better the image quality. Beyond f/16 there is a noticeable decline in quality so these small f-numbers shouldn't be used unless absolutely necessary. Flare and ghosts can be a problem under high-contrast conditions. It performs marvellously with an extension ring added. The PN-11 tube is the best choice and brings with it a tripod collar to help the 180 ED give 1:3 close-ups with tremendous quality. I often use the 180 ED with my F2 Titan.
Be aware that the pre-ED versions (engraved Nikkor P) of the 180/2.8 are inferior in image quality in comparison with the ED 180. Not a bad lens, but the standard of the ED is a tall order to meet.

On the D2X, image clarity is excellent, but as the lens is stopped down, small traces of chromatic aberration (CA) detract from the purity of the image. The amount of CA is by no means excessive, and for many subject and shooting conditions would go undetected. However, to demonstrate I for one noticed this slight deviation from perfection, I have downrated the 180ED for D2X a wee bit. „

“ 180mm AF
The AF versions of the 180 mm lens introduced internal focusing (IF) with corresponding change in optical formula. IF makes for effortless focusing, but tends to give some residual colour fringing in the out-of-focus areas. Image sharpness and contrast of the AF lens is excellent, but the plastic barrel makes the lens feel cheap, this in particular holds for the first release of the AF 180 that had an inconveniently narrow focusing ring. The next version came with a hammered surface finish and improved focusing action. Both version carry a sliding sun shade of questionable length and usefulness.
This lens operates quite sluggish in AF mode, so is difficult to apply to shooting situations in which fast focusing is demanded. In addition, its AF action never is entirely decoupled even when the lens is set to "M", so there is a perceptible drag on the focusing collar at all times. Apart from such caveats it handles nicely, with truly impressive pictorial results in the f/4-f/11 range. Wide open the image is ever so slightly soft, but stopping down helps to improve the image quality to high standards. Contrast and colour saturation are superb. It manages slightly better than the MF180 ED on all scores except for the occasional trace of colour fringing in the out-of-focus areas. This 180 must be ranked among the finest Nikkors of all times in terms of its optics, but on handling criteria alone it never will go into the Hall of Fame. „

“ InteressanteCool pare dica che la sola pecca dell'af siano un po' di frange colorate sullo sfocato, sulle ridotte distanze credo sia molto simili ma ho paura che l'af essendo IF possa perdere qualche punto sulle distanze lunghe, ma tutto da vedere. „

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