The Nikon R1C1 Wireless Close-Up Speedlight System (a.k.a. Macro Kit A) is a macro flash solution for i-TTL capable cameras that do not feature a built-in flash (e.g. D2X, D2H/D2Hs, F6). The kit's main components consist of the SX-1 Attachment Ring that attaches to the lens filter treads via an adapter ring (included), two SB-R200 wireless macro flash heads, and the SU-800 Commander Unit. The SX1 accommodates up to eight SB-R200 Speedlights off-camera and up to four on-camera. 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. 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°.