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The Auto Extension Tube Set K consists of No. 1 (length 12 mm,) No. 2 (19 mm,) and No. 3 (26 mm) rings. The Auto Extensioin Tube Set K couples to the automatic diaphragm and the full-aperture metering mechanism of the lens. Since almost all SMC Pentax interchangeable lenses do have automatic disphragms and full-aperture 4 metering mechanisms, the Auto Extension Tube Set makes close-up work much more convenient.