remember that you have a maximum range from ISO 400 to
Hi 1 (ISO 6400), and the EV steps in between these two
values are decided by the camera.
What happens when the camera reaches its Maximum
sensitivity and there still isn’t enough light for a good
exposure? Let’s find out.
Minimum Shutter Speed
Since shutter speed helps control how sharp an image can be,
depending on camera shake and subject movement, you’ll
need some control over the minimum shutter speed allowed
while the ISO sensitivity auto control is set to On (see
Figure 3-52).
Figure 3-52. ISO sensitivity auto control – Minimum shutter
speed
The Minimum shutter speed setting allows you to select the
minimum shutter speed that the camera will allow when the
light diminishes. In P – Programmed auto (camera controls
shutter and aperture) and A – Aperture priority auto (camera
controls shutter and you control aperture) exposure modes,
the camera will not go below the Minimum shutter speed
unless the Maximum sensitivity setting still won’t give you a
good exposure.
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