Kenko DG Extension Tube Set makes minimal focusing distance shorter and allows to make more close shots of the object. Perfect for macro photography. Set is coming with 10mm and 16mm tube rings. Sales start from May, 2016  Length of tubes 10mm 16mm Diaphragm coupling Yes Yes TTL. EE metering Yes Yes Diameter of tubes … Continue reading Kenko Tokina Extension Tubes Announced: Updated 6/5