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Re:Nikon versus Canon: A Story of Technology Change by maxnoe on Monday April 09, 2018 @11:40PM (#16798842)
Minor technicality: AF Sensors are in the Bottom of the camera in DSLRs.

The main mirror is semi-transparent and reflects most of the light to the viewfinder prism. A smaller part goes through and is reflected by a sencodary mirror to the af sensor in the bottom.

Re:Nikon versus Canon: A Story of Technology Change by maxnoe on Monday April 09, 2018 @11:42PM (#16798848)