sapearl wrote in post #15812401
Tbh I have rarely seen "price drop of lens due to "Cleaning scratch marks" but then I don't purchase too many used lenses these days.
There aren't any here in the forums that I've seen attributed expressly to cleaning, sometimes the reason is never stated, but there are plenty of lenses that come up with scratches on the front element. In the recent past I picked up a 100L that was discounted due to a front element scratch.
I've sold a lens for a friend and it had quite a few light surface scratches (marring that didn't wipe away after using Zeiss lens cleaner).
To be fair, I doubt those light scratches would have affected the image any more than a top quality filter, either.
Regardless, scratched front elements are not a thing of the past, super hard coatings or not. One piece of sand can ruin a lenses surface. So can a dirty fingernail, dirty in the right way. And, of course, so too can a contaminated lens cleaning cloth.