04-08-2015 10:09 AM
A useless button unless you want to rate the quality of your shots using the LCD. The images seen are JPEGs and it hard to tell for serious photographers as to the quality ot the image captured. To really know how good the captured image is, you need to see it in a monitor. You can rate an image up to 5 stars by pushing the button repeatedly.
The biggest shortfall is that one cannot program this button to activate a more useful function.
04-08-2015 10:10 AM
The introduction of a Rate button, like the one on the 5D Mark III allows you to quickly rate images as they are reviewed. It turns 'chimping' (reviewing images) into a worthwhile pastime because the rating is visible when images are downloaded.
04-08-2015 12:05 PM
I've used it all the time. You're right that it's hard to tell on a small LCD. But you don't use it for final rating. I've used it so when I am at home, and download the photos, I can navigate to the rated ones directly and work on them first.
I've run into a situation many times where I took a series of photos, showed it to my model, she loved it, but then after a while there are quite a numbers of shots that she liked and I cannot remember them all. So the rating really help, especially for pre-wedding session.