I just got home and took a quick set of 3 pics, 2 for each set.. one with bad exposure and one with good, if I don't lock the exposure where I want it I can't get these results so its very important. It doesn't eliminate glare, it just makes it work for you and not against you, makes the glare look beautiful and eliminates reflections. Set the camera to spot metering, then move it around while looking through the eyepiece and when the exposure looks right lock it in with ae lock, then focus then shoot. With spot metering, when the centre dot hits a light spot it darkens the exposure and when it hits a dark spot it lightens the exposure, for me its the best way to do it. I also take about 4-5 shots for every one shot I want, all with slightly different exposures. It's only in post processing that I can see all of them together and chose the best one for showing.