Are there any "rules" for using ISO?

Started Apr 3, 2013 | Discussions thread
Barrie Davis
Barrie Davis Forum Pro • Posts: 21,460
Re: Are there any "rules" for using ISO?

Skatterball wrote:

Could be your exposure meter setting.  If you are set at matrix metering you could end up with the exposure being off if you are shooting an animal among bush and wilderness background.  Set your meter to spot-metering and that may help.

Hmmm... my feeling is exactly the opposite.

Spot metering only works if the subject represents a good target for metering. Just BEING the "subject" doesn't do that....

.... (statistically the chances of a subject by itself integrating tonally to the ideal target of an 18% grey are rather worse than a whole scene doing it with an averaging type reading.

On the other hand, evaluative metering is much more sophisticated than mere averaging.

Evaluative metering endeavours to identify the nature of the subject being photographed. It does this by taking dozens of separated different area readings, instead of just one. Then, while also taking into account the general brightness level across those areas, it calls up an actual shutter speed and aperture from its database of known correct exposures for hundreds (thousands?) of subject types.

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