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<blockquote data-quote="aroy" data-source="post: 318951" data-attributes="member: 16090">High ISO decreases your DR - dynamic range. If you can, use ISO 100 and increase your exposure time.ETTR does nothing to the ISO. What it does is to utilize the full dynamic range of the sensor. For example if you have a DR of 12EV, and you are at the extreme right, the DR will be 12. If in contrast you try to under expose by 1 EV (the histogram shifts left), your DR will be 12-1 = 11EV. In digital, you gain nothing by moving left, unless there are a few pixels (which are difficult to see in a small histogram) which will over expose the region around them. This happens when there is a bright, but small (in relation to the rest of the frame) light , say sun or street light. You expose for the average and the bright light will blow area around it. Blown highlights are not recoverable.With a large DR of modern sensors, many scenes do not need the full range, and there, under exposing 1EV gives a safety margin against blown highlights. The best method of cheching DR is to use &quot;spot meter&quot; and point it at the brightest, average and darkest portions. If you use aperture priority, then the range of speeds will give you the DR of the scene.</blockquote>

[QUOTE="aroy, post: 318951, member: 16090"] High ISO decreases your DR - dynamic range. If you can, use ISO 100 and increase your exposure time. ETTR does nothing to the ISO. What it does is to utilize the full dynamic range of the sensor. For example if you have a DR of 12EV, and you are at the extreme right, the DR will be 12. If in contrast you try to under expose by 1 EV (the histogram shifts left), your DR will be 12-1 = 11EV. In digital, you gain nothing by moving left, unless there are a few pixels (which are difficult to see in a small histogram) which will over expose the region around them. This happens when there is a bright, but small (in relation to the rest of the frame) light , say sun or street light. You expose for the average and the bright light will blow area around it. Blown highlights are not recoverable. With a large DR of modern sensors, many scenes do not need the full range, and there, under exposing 1EV gives a safety margin against blown highlights. The best method of cheching DR is to use "spot meter" and point it at the brightest, average and darkest portions. If you use aperture priority, then the range of speeds will give you the DR of the scene. [/QUOTE]

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