I have a Nikon D40 and just got a Canon 6D. I've always wondered - what is that little black dot that is on the front of most DSLR cameras? Both of my cameras have it, but not all do. I've always seen it sit right under the forefinger, which I think would be an odd place to put it if it were, for example, where the plastic was injected. Any idea what it is??
See it circled in red in the attached picture.