The MZ-5n and the MZ-S both easily lose their eyecups. I tried silicone seal, then a large rubber band, but finally found the solution.
In the drugstore, I found small black rubber bands (Goody brand) in the hair section, with hair ties and clips and so on. The packet holds around 20, so you can give some to other Pentax users you meet. The little black bands are just the right size, and almost unnoticeable on the camera. Pat White
