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Inexpensive filter source

Using a cheap filter does not necessarily mean somepne is knowingly using a crap one.

-) one can test them
-) among my 1€ filters most are from reputable manufacturers (B+W, Heliopan, Hoya)
 
Using a cheap filter does not necessarily mean somepne is knowingly using a crap one.

-) one can test them
-) among my 1€ filters most are from reputable manufacturers (B+W, Heliopan, Hoya)
I took out the word "cheap". Happy now
 

The key phrase is "fogged up" not "cheap". I'm sure a fogged up expensive filter would have produced bad images, too.
 
Interesting. But aside one or two polarizers I have not yet come across any fogged filter, aside of course being fogged from being stored in those plastic cases witzh polyether foam. The latter may have fogged a filter over decades. But that is just a matter of cleaning.
 
Well, one specific cheap filter I am extremely grateful for is the one the past owner of my Fuji 69 rangefinder kept over the lens the entire time. It was hazed and scratched like crazy, and not doubt caused every single shot to be miserably compromised. But it took me only five seconds to cure by throwing that off-brand UV filter into the trashcan. The lens itself was immaculate, as if it were brand new - not even any dust.