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Internet Message Format  |  1992-12-29  |  846 b 
  1. Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!wupost!csus.edu!ucdavis!toadflax!auyeung
  2. From: auyeung@toadflax.cs.ucdavis.edu (Tak [UlTech] AuYeung)
  3. Newsgroups: rec.photo
  4. Subject: Re: Which lenses report focusing distance electronically?
  5. Message-ID: <20610@ucdavis.ucdavis.edu>
  6. Date: 29 Dec 92 09:28:35 GMT
  7. References: <TJWU.92Dec28153541@carbonara.mit.edu> <1992Dec28.205950.16887@walter.bellcore.com>
  8. Sender: usenet@ucdavis.ucdavis.edu
  9. Organization: Department of Computer Science, University of California, Davis
  10. Lines: 11
  11.  
  12. In article <1992Dec28.205950.16887@walter.bellcore.com> jchen@bellcore.com (Jason Chen) writes:
  13. >
  14. >Huh? If not how does TTL flash work?
  15. >
  16. >Jason Chen
  17.  
  18. I suspect some TTL mechanisms read from the film-plane to "see" the
  19. actual light reflected (otherwise, bounced light would be quite
  20. difficult to compute).
  21.  
  22. --Tak
  23.