Exposure basics, lesson two point one (& ISO)

Started Mar 19, 2013 | Discussions thread
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Great Bustard
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In reply to Chris Noble, Mar 21, 2013

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.

I like it! Not just the Read noise; also analog gain noise?

The read noise is simply all the sources of noise from the sensor and supporting hardware lumped into a single figure.  Thus, Total Noise = Photon Noise + Read Noise, where "+" represents the quadrature sum:  P + R = sqrt (P² + R²).

So "ETTR up to ISO 400"? 800?

ETTR is always best when possible, as it increases the actual exposure which lowers the photon noise, and this has a more dramatic effect on lowering the overall noise than using a higher ISO to lower the read noise.

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