fjrwillie wrote:
When Do Use Exposure Compensation. I have rarely used, and maybe never, used EP and wondering when one uses EC. Do you change the metering methods from matrix, to center weight or spot. Only when in Manual mode versus Aperture or Shutter. All of my captures are RAW with Post Processing. I use a Nikon D7100, but the question isn't really camera specific
Willie
First of all, Exposure Compensation is a means of overriding and "correcting" AUTO EXPOSURE. It doesn't apply to Manual mode (unless you are using Auto ISO, in which case it's no longer actually manual mode anyway... it's another auto exposure mode).
I use E.C. frequently. Camera metering systems are all "reflective", which means they "read" the light being "bounced" back toward them from the subject and are highly influenced by subject tonality. Light tone objects are reflecting a lot of light, while things that appear dark absorb most of it and reflect much less. Unfortunately camera metering systems are also "dumb" in that they don't "know" if the object being photographed is white or light colored or if it's black or dark colored. The meter system can only interpret everything in front of it as "average tonality" (often referred to as "18% gray", regardless of the colors involved).
For example, if you're pointing your camera at a bride in a white dress in a snow scene, the camera is going to want to under-expose it and make it "18% gray"... so you need to dial in some + E.C.
If, on the other hand, you're photographing a black bear in a coal mine, the camera is still going to try to make it "18% gray" and will want to over-expose... so you need to dial in some - E.C.
How much E.C. is needed either way really depends upon the scene and the metering mode you're using. You'll need to use your judgment. Many scenes of mixed tonalities average out nicely to 18% gray and won't need any E.C., so long as you're using a "wide" metering mode such as Matrix (aka Evaluative) or Center Weighted. But if you are using narrower Partial metering or even more precise Spot metering, you may need to make corrections with E.C. How much again depends upon the exact tonalities you're dealing with.
I don't use the same camera as you, but some use the same scale to display fully manual settings as they do for Exposure Compensation. And you may need to skew manual settings in a similar way. But that's actually not the same. You may do some compensation in manual mode, but Exposure Compensation itself really only applies to auto exposure modes (aperture priority, shutter priority, program and manual with auto ISO).