The Nikon R1 Wireless Close-Up System (a.k.a. Macro Kit B) is a complete flash solution for cameras that feature both the Commander mode and include a built-in flash. The kit's main components consist of the SX-1 Attachment Ring that attaches to the lens filter threads via an adapter ring (included), and two SB-R200 wireless macro flash heads. The SX-1 Attachment Ring can accept up to eight SB-R200s and can be attached to a tripod for remote lighting. This solution enables excellent close-up lighting control with exceptional flexibility and innovative options. Built-in target light and AF Illuminator allow for proper position of Speedlight on the subject as well as autofocus operation in low light situations. Offers four independent channels for competitive shooting environments. Auto FP High-Speed Sync; used with fast shutter speeds achieves effective blurring of out-of-focus background elements. Flash head tilts down (toward the optical axis) to 60° with click stops at every 15°, or up to 45° (in the opposite direction) with click stops at every 15°.