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Hi Al,
I have a spare IR filter, god knows where I got it from.
I am not sure if it is even an IR filter, but it is clear.
Brand? No idea, it has "knurling" around the section that is closest to the female thread. It reminds me of the CS ones I had eons ago, but can't be any more helpful. If you want to try it then you are welcome.
I can shoot a picture too if it helps.
Regards,
Gary
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