|Posted: Tue Jan 09, 2018 11:14 am Post subject:
|Optical glass and filters have different resistance to humidity and chemicals. A coating shiled the lens against these influences.
So it is possible, that such a thing happens. Glass corrosion has made some of my lenses unusable (before I bought them).
Regarding the effect of polishing: The lens surface form changes likely, this could be a big problem. The lens thickness is unlikely to be much problematic, cause production tolerances are likely higher.
But: In some extreme lenses the production tolerances could be compensated with for example paring other lens tolerances with it, or withdifferent thickness washers.
Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
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