beb9b9f4   
   XPost: alt.photography   
   From: dadiOH@invalid.com   
      
   RichD wrote:   
   > What does 'single lens reflex' mean?  Where/who/why   
   > does this term come from?   
      
   It is a camera with one lens as opposed to two (which is a twin lens   
   reflex - one lens for taking, the other for viewing).   
      
   It is a "reflex" because the light from the lens bounces off a mirror to a   
   ground glass for vertical viewing and focusing; later, another mirror or   
   prism was added so the image could be viewed horizontally through an   
   eyelevel finder.   
      
   The term has been used for cameras of that type since before I was born and   
   I am 78.  Initially, they were large format (3 1/4 x 4 1/4 and 4 x 5)   
   cameras.  The Graflex was one such much used by press photographers; also by   
   sports photographers, often with a 40" lens.   
      
   The first 35mm SLR I know of was the Exacta in the early 30s.  Post WW2   
   (late 40s), it became the Kine Exacta and it and its little brother, the   
   Exa, sported eyelevel finders.  The first eyelevel 35mm SLR with a   
   pentaprism was the Contax S.   
      
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   dadiOH   
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