It was a misnomer … LR supports adjusting the overall exposure in the range of 
+/- 5 EV total. 

That means that if you have a 'ISO-less' sensor, in other words, a sensor where 
the ISO settings on the camera are implemented by just biasing the captured 
data by an EV offset. For example, if the native ISO of the sensor is 200, you 
can achieve up to an effective ISO 6400 with it using Lightroom. I tested this 
with the Leica M9 and it worked perfectly; useful on that camera because the 
on-camera ISO setting is limited to ISO 2500. 

However, it means that you can't really see what you're doing, exposure-wise, 
with the review function on the camera, and I didn't find anything particularly 
better about the quality of the output images—they looked identical to using 
the ISO setting on the camera. 

G

> On May 20, 2016, at 8:51 PM, Jack Davis <[email protected]> wrote:
> 
> I simply noted a reference to LR "exposure compensation" and it set me to 
> wondering
> what it might uniquely offer.
> Thanks all who responded!


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