Default: No shift
In HDR mode Promote Control steps an equal number of steps up and down from your Mid/Hi/Lo exposure as specified. Sometimes you may find it useful to shift your HDR brackets towards shadows or highlights. As an example, HDR bracket of 7 exposures with a step of 2.0EV will result in 7 images taken as follows:
-6 EV steps from the "Mid Exposure" shutter speed
-4 EV steps from the "Mid Exposure" shutter speed
-2 EV step from the "Mid Exposure" shutter speed
The "Mid Exposure" shutter speed
+2 EV step from the "Mid Exposure" shutter speed
+4 EV steps from the "Mid Exposure" shutter speed
+6 EV steps from the "Mid Exposure" shutter speed
If you change this settings to e.g. "1 step(s) to shadows", the same settings will define another sequence:
-8 EV steps from the "Mid Exposure" shutter speed
-6 EV steps from the "Mid Exposure" shutter speed
-4 EV steps from the "Mid Exposure" shutter speed
-2 EV step from the "Mid Exposure" shutter speed
The "Mid Exposure" shutter speed
+2 EV step from the "Mid Exposure" shutter speed
+4 EV steps from the "Mid Exposure" shutter speed
Promote Control will still take 7 images total, but they will be shifted 1 step towards shadows. Note that "steps" used in this setting is not the EV step - it's whichever step you define in your HDR settings. In example above, the sequence was shifted 1 step to shadows - and since your HDR bracketing was set to 2EV between images, the sequence was shifted down 1 step of 2EV.
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