Sensibility versus definition

Started Jan 7, 2015 | Questions thread
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PeterBM New Member • Posts: 4
Sensibility versus definition

Why, for the the same camera, have i the same sensibility for different image definitions?

For example for a given scene:

- full definition 4000x3000 pixels at 200 ISO F4.0 good time is 1/100s

- 1/4 definition 2000x1500 pixels at 200 ISO F4.0 good time is still 1/100s. Why isn't it 1/400s ?

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