So, just tried it R7, Sigma 18-35, dim living room with stand-lights near walls.
Off: Lightroom shows ISO 3200.
D+: Lightroom shows ISO 2500.
D+2: Lightroom shows ISO 1600.
Image are progressively darker in Lightroom, so it's not applying a curve, or boosting exposure.
Setting D+ image to expose +0.4 looks the same as off. This can be setup easily as a preset.
Setting D+2 image to expose +1.0 looks the same as off. This can be setup easily as a preset.
Turning down exposure to see highlight clipping.
Off: Significant clipping.
D+: Clipping at brightest spot
D+2: No Clipping
HTPDimmed by Dave E, on Flickr
So, it does what it says on the tin. Would be nice if Lightroom could automatically apply a curve or simple default exposure adjustment.
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