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CMS-XML Information on the EF II extension tubes.
The Extension Tubes EF12 II / EF25 II are close-up photography accessories for EF lenses that are mounted on the rear of the lenses. While inheriting the basic specifications such as tube length from the EF12/EF25, the EF12 II / EF25 II have a larger inside diameter than previous models so that it can be attached to EF- S lenses.