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            TIP 1: When you’re in AF-S mode and in continuous drive mode, the exposure is
            locked along with the focusing.  (Exposure is never locked in AF-C mode.)
            TIP 2: Some lenses have their own focus mode switch on their side.  What if they
            conflict with the Focus Mode knob setting?  I talk about all the permutations in
            Section 10.17.




           3.5      ISO

           You probably already know everything you need to know about ISO:
              Rule: The higher the number, the more sensitive the camera is to light.
              Corollary: The more sensitive the camera is to light, the more “noise”
               appears in the image.
           So  for  the  best  image  quality,  your
           goal  will  be  to  use  the  lowest  ISO
           you can for the amount of light you
           have and for how fast your subject is
           moving.
           But, you can choose more than just
           the  ISO  value  when  you  go  to  the
           ISO  menu  (Figure  3-10).    There’s
           also an  Auto  ISO  setting  where the
           camera can choose one for you (and
           you can specify the upper and lower   Figure 3-10:  The ISO selection screen.
                                               At  the  top  of  the  list  is  the  “Multi-
           bounds),  and  there’s  an  unintuitive   Frame Noise Reduction” feature which
           feature  at  the  top  of  the  list  called   is a great tool for low light if you don’t
           Multi-Frame  Noise  Reduction.    I’ll   have a tripod.
           get to all those in a minute.
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