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The Nodal Ninja Ultimate R1/R10 V2 Lens Ring is specially designed for Canon 8-15mm fisheyes. It has been asking for modifications of existing lens rings to allow full access of controls on the lens. They made modifications to the plastic insert and outer metal ring to allow for reading the focus distance in both landscape and portrait orientations. And in some cases, switch(es) on the lens can also be accessed through these windows. The new V2 is compatible with R1, R10, RS1/2 and M series model heads.