"But at low ISO nothing can beat this camera." - CEO SIGMA

Started Feb 17, 2014 | Discussions thread
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joejack951 Senior Member • Posts: 2,682
Re: What gimmick is this?

enemjii wrote:

ISO rating is the measure of a photographic film's sensitivity to light (courtesy wikipedia).

That said, if Foveon sensor is able to capture more details at low ISO, which in turn means it is more sensitive to light coming through, is it really LOW ISO ? or is it merely fooling around with methods of measurement?

Digital camera "ISO" is not the same as film speed ISO. From the "Film Speed" Wiki page:

"For digital photo cameras ("digital still cameras"), an exposure index (EI) rating—commonly called ISO setting—is specified by the manufacturer such that the sRGB image files produced by the camera will have a lightness similar to what would be obtained with film of the same EI rating at the same exposure."

Notice the lack of the word "sensitivity." Your digital camera sensor does not capture light any differently at low ISO settings than it does at high ISO settings. The captured data is processed differently, though.

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