This new version mark II extension tubes are the only tubes compatible with new EF-S 18-55mm lens
White index mount is for EF-S lenses ; Red dot is for use with EF and TS-E lenses
Canon EF 12 II Extension Tube is especially suited for close-focusing with Wide-Angle lenses
Extension tubes work well with telephotos to allow closer focus tham normally possible
Manual focusuing is recommended, and with zoom lenses, focus after zooming is completed.