I got these for a couple dollars at an electronics flea market. They look like maybe some kind of dichroic lens, but I don't know. Can anyone help identify them? Did I get a good deal for a couple bucks? Here's the first one. It's hard to tell from the picture, but it's got a slight red tint: http://i.imgur.com/RvQFLh.jpg The side has printed on it: 110-0006-RD CVI 211020 Here's one side of the next one: http://i.imgur.com/1bUII.jpg And the other side: http://i.imgur.com/Mtovgh.jpg The top of the case has a sticker that says Continuum Part No: 105-0022, Rev. F S/N: 2213+2214 I don't know much about optics, but I have a HeNe laser and thought these might be fun to play with. I'd be much obliged to anyone who can help identify.