The Zen mini dome for the Canon 8-15 is a great addition to anyones underwater kit. The Canon 8-15 fisheye is the best zoom fisheye I have ever used and the Zen mini dome is perfectly matched. It has a removable shade to accommodate the 8mm range of the zoom on a full frame camera. The small size allows you to get closer to your subjects and still be able to light them properly. Its also much easier to push though the water. Mini domes only work with fisheyes so you will still want to get a big dome for rectilinear lenses and for the perfect split shots!