
Initial impressions matched Bjorn Rorslett's opinions - I thought the lens wide open was a little weak, and certainly not as good as the 28mm f/2.8 AIS. Very near focus, wide open it's ok but mid distance seems to very bland.

f/2.8 near MFD, on DX
Stopping down sharpness at middle distances improves the quality a little but its not a massive improvement.

f/2.8 - f/4 - f5.6 centre crops

f/2.8 on DX
This lens also has pronounced barell distortion.
Servicing this lens produced from 1981-89 is relatively simple, although there are a few sealed components like the retaining ring that sits on the focus ring. I found the helicoid mating position a little challenging with a number of potential starts very close together but its relatively easy to clean. Using a grease like the NPC BC-13A gives it a very nice dampended but fluid feeling.

Accessing the elements is reasonably simple once you have the front retaining ring off.
Not a great deal more to say about the lens. It handles nicely in the hand if you service it. The colours are nice and rich but I still prefer the 28mm f/2.8 AI-S for its rendering.
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