I am interested in UV photography but it costs a fortune. However, I was thinking about the cost of UV pass filters (about £300 ish) and deciding that I would stick to playing with IR when I had a thought. What if I take an image twice, once with a UV filter once without, and then difference the images. That is fine but modern lenses block UV and the high quartz lenses that don't cost around £10000. Then someone told me that old Russian Bloc lenses don't block UV very well. So I bought an old Soligor 35mm f3.5 manual iris lens for £30, much more interesting. These images are with that, the registration problems are due to the Polaroid UV filter not being very optically flat, I have a better Nikon one but didn't realise that this one was poor until too late.