Exposure basics, lesson two point one (& ISO)

Started Mar 19, 2013 | Discussions thread
Chris Noble
Chris Noble Senior Member • Posts: 2,854
Pushing ISO in order to ETTR

Certainly. Remember that my entire post is written under the assumption that exposure can't be increased (as implied by the low-light scenario described by Jack Hogan). If exposure can be increased without negative side-effects, it is of course better to stay at ISO 200 and increase exposure to reach the ETTR criterion than to keep exposure unchanged and go to ISO 400. However, if exposure cannot be increased, it is better to go to ISO 400 and ETTR rather than to remain at ISO 200 and stay one EV short of ETTR and that was the point I was making here.

True from ISO 200 to ISO 400, as the improvement in DR is greater than the increase in noise. Not true from ISO 1600 to ISO 3200, as the noise increase is now greater than the DR increase. "Pushing" ISO in order to ETTR only works in the linear noise region of the sensor -- up to ISO 400 or so for CMOS.

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