You can’t lose by making an additional exposure.
When ETTR really helps
The following situations show even a low level of noise:
- Glossy surfaces as in product photography (e.g., paint on an automobile).
- Out of focus backgrounds of uniform color and/or with smooth gradients of uniform or varying color (portraiture, or a sky/horizon gradient).
- Smooth areas of water or reflections.
- Black and white conversions from a specific color channel.
- Dark blue sky (very underexposed red channel).
Subjects in which there is a great deal of detail help mask noise, but if one wishes to bring up the shadows, noise in dark areas can be very difficult to deal with— ETTR fixes that.
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