Exposure basics, lesson two point one (& ISO)

Started Mar 19, 2013 | Discussions thread
richarddd
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Re: Pushing ISO in order to ETTR
In reply to Great Bustard, Mar 21, 2013

Not quite. Increasing ISO so as to ETTR while keeping exposure constant is an advantage in that region where the relationship between camera ISO and DR is nonlinear, i.e., the region in which read noise (as measured in electrons) keeps falling with increasing camera ISO. On the E-M5 it falls up to about ISO 1600 although the main read-noise reduction occurs between ISO 200 and ISO 400.

I thought the EM5 had relatively constant read noise from ISO 800 on up:

http://www.sensorgen.info/OlympusOM-D_E-M5.html

By the way, probably better to refer to "ETTR via higher ISO" as "BTTR" (brightness to the right) or "GTTR" (gain to the right), as the exposure is unaffected.

Those who insist that people use the official definition of exposure might look a bit odd using their own versions of the well accepted ETTR

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