UPDATE: My memory stick came in this morning, and I was able to take some pics using my jury-rigged filter stack. Results are interesting! There’s some visible light frequencies getting through the stack, and having 5 very dark bits of glass in front of the lens doesn’t result in great sharpness, but it works!
You can click to embiggen these pics. I uploaded them at about twice the size of the pics I normally post.
All in all, first experiment is mostly successful, I think. I do need the proper filters, but since I’m broke, I’ll be doing more experiments using stuff I actually have around the house. I’ve read somewhere that old floppy disks can be used as poor man’s IR passthrough filters – I’ll have to try that. Also I think I still have some old stripper’s rubylith sheets around which I might try out. Fun, fun, fun! :D