I used a pringles container. If you remove the inside of the lid so your left with just the outer ring you clip the lid ring back to the container with the film in between and then all you need is a bit of take or two to stop the filter from falling off.
Definitely film is your best option.
A ND filter does often get touted about as useable but remember you can't look through your viewfinder as it will still fry your eyes.
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