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Two sides of the argument and both are equally valid.
The key issue is the coating on the lens rather than the technology of the film. AST @tinakino said, try with and without. Personally, if I’m using old lenses I tend to do so without filters because I like how they perform, flaws and all. I confess I do use UV filters for protection on expensive modern digital lenses, even though I know I really don’t need to.
For film, I do use square filter holders for landscape when I need ND grad to retain detail in the sky as well as exposing properly for the foreground. Especially if shooting slide film. Because I have them for that, I also have some strong ND filters for long exposure shots on film and digital. Not Cokin though, I use Formatt Hitech
Has there been a discussion about using UV/sky/polarising screw on filter on an slr lens for protection. Do the screw on filters increase lens flair? Do modern colour or black and white films need 'help' that a uv or sky filter would give?
Am asking as I have been reading about using screw on filters to protect the lens, as I was told, but there seems to be two opposite side to the discussion.
Do you still use the cokin square filters any more.