• I've generally found cameras to be pretty resilient at not showing up front element grease and smudges on the photo. I've shot with some pretty hazy lenses in the past with dust/fungus trapped in the middle of the lens and photos from them have come out ok too.
    Heck, dust on sensors only shows up in extreme conditions - solid block of colour, lens stopped right down.

    Only use filters for B&W film to darken down skies.

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