Extension Tube EF 12

Official Remarks

Extension Tube EF12 can be used with EF lenses except the EF 14mm f/2.8L, 50mm f/1.0L, and lenses which cannot be focused manually.

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All pictures scanned from Canon brochures, in which the original image is actually about 10 times smaller than the image that you see above.
Hence, the resolution of the above image is limited by the original size of the brochure image.  The image above is life-size.