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358                        The “Setup” (Toolbox Icon) Menu Settings















                                     f/2.8               f/5.6













                       F/11                                                         F/22














                                                  F/32

          Figure  9-5:  Sensor  dust  doesn’t  usually  show  up  in  your  images  unless  you’re
          shooting  with  small  f/stops,  like  f/32.    Above  are  five  pictures  (with  the  contrast
          enhanced  so  that  the  dust  appears  more  visible);  notice  that  at  f/2.8  it  doesn’t
          appear at all, but as you make the lens opening smaller the dust begins to appear
          more blatant.  (Note that the dust will have to work very hard to migrate past that
          fixed mirror.)





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