I used this on my Eos R+RF 24-105 for macro photography of flowers in a botanical garden. A piece of 13 mm was just suitable for this. I love that I can use the zoom on my lens as opposed to a fixed macro lens. Depending on the zoom and aperture settings, I can vary the bokeh proportion. The autofocus doesn't seem to work, but I wouldn't use it for macro photography anyway.
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