Phase One Auto Extension Tube Set

Supports all Phase One, Schneider Kreuznach and Mamiya lenses. When attached via an Auto Extension Ring, all lenses operate as manual focus, and are limited to manual focus and focal plane shutter use. The electronic contact set ensures auto aperture functionality on lenses which features this. There is practically no light intensity degradation when using the extension rings, and there are no optical dispersion since no glass elements are added with the Auto Extension Rings.