Originally posted by JonPB The histogram is the best way to evaluate an exposure. Essentially, the exposure meter is predicting what the histogram will look like; if you can look at the histogram of an image, then adjust your exposure settings accordingly, you'll be more likely to get the exposure level that you want. So you're not working at a beginner's level in that respect.
However, aperture is just as important as shutter speed for determining exposure. You would benefit enormously from reading about how aperture and shutter speed both affect the resulting image--or, even better, taking images at different apertures and seeing what happens, and then reading about it to understand what's going on.
Hope this helps.
Thanks... Your answer and dlacouture's answer helped clarify what is going on. As for the aperture and shutter speed, I understand these. I just have never worried much about the variation in exposure that comes with the changing aperture because I typically compose for a single aperture value and adjust the shutter speed to get the right exposure. My inexperience comes in finding it easier to ignore the variation in EV that comes with the various aperture values and using the histogram to make adjustments.
Only now, I am trying to at least get a rough idea of how the aperture affects the EV value to reduce the number of reshots I find myself taking. Your graphs and the discussion here, will help quite a bit.
Thanks.