“An extension tube is an accessory for cameras with interchangeable lenses, used primarily for macro photography. The tube contains no optical elements; its sole purpose is to move the lens farther from the image plane. The farther away the lens is, the closer the focus, the greater the magnification, and also the greater the loss of light (requiring a longer exposure time).” -Wikipedia
Its not macro, but perhaps “near macro” would be an apt description. Using the extension tube means I was about 3-4" from the rose bloom. As one sometimes does with macro, you can’t get the entire subject in focus at the same time. The EF 50mm f/1.4 smallest aperture is f/22, which I used to get most of the rose bloom in focus.