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Bullseye5d2 - That was reassuring that it won't show up if I printed the pictures. Thank you!
No it's just for you to see where the point of focus was. If you think about it , when you have multiple points active then when you come to review your image and the part you thought you wanted in focus isn't , you can use it to tell if the camera focused on something else.
Its not foolproof , if you focus and recompose the red point will not be over the point of focus.
Also some software can use it as well. The canon software than came with the camera does . I know there are a couple of others as well. But photoshop and Lightroom dont