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Again, like shutter and aperture scales, there is a relationship between
successive numbers in the ISO table. Higher values relate to higher
camera sensitivity.
Higher sensitivity allows us to capture low light level images with hand
held shutter speeds of 1/15 second or so!
100, 200, 400, 800, 1600, 3200: are the full f-stop equivalent values.
Once again the relationship is half, or double, when you go from one
step in the table to the next.
With the FZ200 it is possible to set the increments that will appear as
you adjust ISO value to match the shutter speed and aperture 1/3 f-stop
increments. This is done in the “tools” set up menu.
If you set this incremental 1/3 step value it, does give you finer control of
ISO setting.
Now we know the relationship of the values in the ISO, Aperture and
Shutter speed tables we can apply this knowledge to our manual
exposure mode.
When we looked at the exposure triangle we saw the need to identify the
one component in the equation which had the most impact on our
photographic image.
If we wanted the lowest image noise level then we would set the ISO to
the lowest value as we know this reduces image noise.
If we wanted a very shallow DOF for a portrait we would choose a large
aperture (small f-stop number like F2.8).
If we wanted to capture silky waterfalls we would set a very long shutter
speed in the order of 1-2 seconds or more.
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