Exposure Basics, lesson three?

Started Mar 18, 2013 | Discussions thread
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richarddd wrote:

Somewhat counter-intuitively, for fixed aperture/shutter speed, it is best to use the highest possible ISO (without clipping highlights) ... Read noise at high ISO is much smaller than read noise at low ISO, in terms of the error in photon counting that it represents. Thus, better image quality is obtained for using the highest ISO for which the signal is not clipped.

http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3.html#ETTR (paper written in 2008 and updated 2010).

...when the higher ISO settings result in less read noise, which is not true for all sensors, and, even for sensors where it is true, the read noise almost invariably levels out after some point (e.g. ISO 800 for the EM5), after which point, optimum IQ is achieved by not raising the ISO any higher.

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