Hey!!! MEGA!!! I've actually just found exactly the same thing in the case with my enlarger!!! (don't ask....) As most of you know by now I've tinkered with photo's in the past (as a kid...!) but never took it seriously...well, anyways, I've never had a filter adapter for my camera so never really saw the point of these filters, and used to use them while printing to get a white vignette around the picture by throwing them in the filter tray of the enlarger...... lol Now I'm grown up and clever, I might try to use mine properly too!!! (",)