▪ 200, 250, 320, 400, 500, 640, etc.
Now, if you set ISO sensitivity step value to 1/2 step instead,
the pattern looks like this:
▪ 200, 280, 400, 560, 800, 1100, etc.
Finally, if you set ISO sensitivity step value to 1 step, the
pattern changes as follows:
▪ 200, 400, 800, 1600, 3200, and Hi 1 (6400)
Clearly, these are one full step (or stop) changes in ISO
sensitivity values. You can be as tight as 1/3 step EV or as
loose as 1 step EV when you change sensitivity.
My Recommendation: I like the most control I can have
over ISO sensitivity increments. I normally leave this set to
the factory default of 1/3 step. This allows me to carefully
fine-tune the ISO sensitivity value for precise exposures.
EV Steps for Exposure Cntrl.
Custom setting b2 (D300S and D300)
(User’s Manual – D300S page 270; D300 page 275)
EV steps for exposure cntrl. refers to the number of steps in
the shutter speed and aperture since those are your main
exposure controls. It also encompasses the exposure
bracketing system. Just as with the ISO sensitivity covered in
the last section, you can control the number of steps in the full
range of exposure values.
Here are the three settings available for exposure control:
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