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  1. Path: sparky!uunet!olivea!charnel!rat!usc!rpi!bu.edu!news.tufts.edu!pearl.tufts.edu!rsmith
  2. From: rsmith@pearl.tufts.edu
  3. Newsgroups: rec.photo
  4. Subject: 81A, 81B, & 82A filters: What are they for?
  5. Message-ID: <1992Dec31.102656.1@pearl.tufts.edu>
  6. Date: 31 Dec 92 15:26:56 GMT
  7. Sender: news@news.tufts.edu (USENET News System)
  8. Organization: Tufts University - Medford, MA
  9. Lines: 5
  10.  
  11. I've got three filters that I got years ago.  They were originally lying around
  12. with some unused equipment or something that my father found, so I don't know
  13. what they're for.  One is an 82A (light bluish-green color), the others are
  14. 81A and 81B (brownish-yellow).  What are these things used for?  Thanks for
  15. any information.
  16.