How much does a scratch affect the quality of a lens?

How much does a scratch affect the quality of a lens?

I’m sure we’ve all heard the horror stories. “ONOZ! My lens got a scratch, it’s ruined!!” someone screams, then goes to quietly cry in a corner. “Welp, shoulda used a UV filter, if those get scratched you can just replace them, now you have to sell that lens for half what its worth on eBay” People thinking this isn’t a...Read more