Elinchrom Stackable External Diffuser For Rotalux Octabox 135cm. Diffuses light evenly and cleanly when mounted to the front of the Rotalux Octabox 135 cm. Suitable for use in conjunction with Rotagrids, stacked for multiple levels of diffusion, or as a replacement for a worn Rotalux External Diffusor. Elinchrom are a Swiss studio lighting manufacture famed for their consistent innovation and being at the forefront of both portable and studio photographic lighting equipment. Since the start in