Fast lenses, and High ISO

Started Jul 18, 2014 | Discussions thread
jonas ar Regular Member • Posts: 378
Re: You missed the question.

EinsteinsGhost wrote:

Because a competent photographer knows exposure is not dependent on format. It is dependent on: ISO, Aperture and Shutter values for a given scene brightness. That is it.

According to wikipedia photographic exposure is the amount of light (the image plane illuminance times the exposure time) reaching a photographic film (and you may substitute film with "sensor" if you like).

I can see how the aperture and shutterspeed (and the scene brightness) affect the exposure in this defintion, but please do explain how ISO affects the amount of light reaching the sensor. Or do you not agree with wikipedia on the definition of exposure?

Can you not see that changing the ISO is fundamentally different from changing the amount of light recorded?

Do you really think that we change the exposure when we use the exposure slider in raw processors (or modulate the image brightness of the developed picture in other ways by software)?

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