I was recently at a photography store looking for a ir filter that I can use with my Nikon D50. The store clerk said they did not carry any IR filters, but did recommend a poor mans alternative.
She said to crack open a few old 3.5" floppy disk and use them as a filter.
I tried this and found the disk to work as a super dark red, but I am unsure if it is trully IR. Is there some test I can do find this out, or haas anyone else heard of such thing?