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Smearing a translucent gel, such as Vaseline, around the perimeter of a cheap, glass filter is an old-school, analog effect I like play around with. Of course I can get similar effects digitally, but I like the randomness of the tactile, physical gel. I've got to constantly adjust the thickness and placement of the gel during my shoots to achieve the particular effect I'm looking for. And going out on a shoot with a gel-smeared glass brings the play back into my walks and opens my eyes to subjects that I might otherwise pass by.