to dim very bright objects such as sun
I would suggest a "leaky" mirror such as the ones from sideview mirrors from cars. The busted ones that I have disassembled are all leaky.
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The biggest problem is that the film base will not be clear. It would be like putting dark wax paper in front of your lens.
If you want to shoot the sun, you're better off and safer with Baader filmhttp://www.baader-planetarium.com/sofifolie/sofi_start_e.htm