Started Dec 20, 2013 | Questions thread
Paul De Bra
Paul De Bra Forum Pro • Posts: 12,397
It's a matter of making use of ALL the signal the sensor captures.

When you lower shutter speed or open up the aperture a bit (but staying at the same ISO to not increase sensor noise!) it's important to not clip highlights but to use as much of the signal the sensor can capture. So the idea is to use all 12 bits or 4096 intensity levels the sensor can capture.

The result of ETTR is lower noise, not just because of using all the values but also because of the non-linear behavior of the sensor.

Clearly the downside of ETTR is that it is more likely that highlights will be clipped. If you take a few shots at slightly higher and lower exposure you can find the best exposed image where highlights are just not clipped. Near the top of what the sensor can capture the behavior is not linear but a good RAW converter will compensate for that.

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Slowly learning to use the Olympus OM-D E-M5.
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