I am curious to know if the coating used for lenses fades over time or not, especially on the interior elements? Lens coating seems to be one of the most closely guarded secrets of camera manufacturers, so other than the praise they all say about the benifits of multi coating, no one seems to mention how long it lasts. I have several old Nikon lenses that appear to still have their coating intact (except of course for the exterior front element which has probably worn out in time due to wiping smudges and dust). However, I noticed that on a really old Nikon lens I had (a 50mm 1.4 for my S2 Rangefinder) the images did not look as color saturated and contrasty as they did with my Nikon 50mm 1.4 newer AIS lenses. lso, the colors were very bland despite the fact that I used the same film and shot the same subjects at the same time with different cameras. It would be nice to know how long the coating lasts, especially if one is considering buying an old lens. Also, are there places that re-coat lenses? Would it be cost efficient, even worth it?