The Interfit Strobies softbox will give a soft uniform light source and is ideal when combined with a reflector or other Strobies products to add a fill light. Using the softbox in iTTL or eTTL flash mode requires no adjustment to your exposure systems. The softbox is easy to put together and fits directly onto the Strobies Flex Mount (sold separately). A soft carry case is also included. A flex mount (sold separately) is needed to attach this to your flash unit. Flex Mounts (sold separately)are available to fit the following flash units: order code SGM100 for Nikon SB600 / SB800; order code SGM200 for Sony F32X / Canon 430EX; order code SGM300 for Sony F56AM / Nikon SB26/27/28; order code SGM400 for Canon 580EX / 550EX; order code SGM500 for Vivitar 285 HV; order code SGM600 for Nikon SB900. order code SGM700 for Canon 580EXMKII.