How are ISO speeds in photography computed? - Freemason Hirams Travels Masonic Forums

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03-27-2008, 03:50 PM

Vincent L

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How are ISO speeds in photography computed?

Is an ISO 200 twice as sensitive as ISO 100, ISO 800 twice as sensitive as ISO 400 ... and so on ? For shooting dark targets such as astronomical objects, will a picture taken at ISO400 require twice the amount of time to have similar brightness as another taken with an ISO800 (Assuming noise are not considered)?

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