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Text File  |  1992-12-29  |  837 b   |  25 lines
  1. Newsgroups: rec.photo
  2. Path: sparky!uunet!wupost!sdd.hp.com!hp-cv!hp-pcd!hpcvaac!billn
  3. From: billn@hpcvaac.cv.hp.com (bill nelson)
  4. Subject: Re: Which lenses report focusing distance electronically?
  5. Message-ID: <1992Dec29.115218.6743@hpcvaac.cv.hp.com>
  6. Organization: Hewlett-Packard Company, Corvallis, Oregon USA
  7. References: <20610@ucdavis.ucdavis.edu>
  8. Date: Tue, 29 Dec 1992 11:52:18 GMT
  9. Lines: 14
  10.  
  11. auyeung@toadflax.cs.ucdavis.edu (Tak [UlTech] AuYeung) writes:
  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. This is called OTF (Off the Film) metering.
  23.  
  24. Bill
  25.