Yesterday I picked up a boxed/as new Nikon 135mm f/3.5 Ai-s lens for £40 at my local camera shop. While I wait for the dense grey claggy cloud and high winds to ease I thought I would ask if anyone else here has and uses this lens. I see mention of the Ai, but not the Ai-s - so was wondering if there were any optical differences, coatings etc - or is it just the Ai in new clothes? It seems a compact and well built lens (quite heavy) - and the pull out hood is a bonus. I tried it on my Df and set up the non-CPU lens in the menu - and it seems easy to focus despite not being f/2.8. Thanks for any input - not had a new lens for quite a while and I am looking forward to using it.