Really quick with/without test, took 2 minutes making the filter and 5 minutes whipping this up in premiere.

Not a bad filter for less than a fiver. And much better than doing it in post.
Used the nylon method mentioned here:

I used a dirty UV filter (tut tut) with some 3mm nylon stretched vertically across the front element, and attached it with a rubber band around the rim.
I'll have to make a more pro looking one before I do any jobs with it, preferably with less dirt on the glass.

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