studio flash light Visual LCD display with high definition ... 2013 Hot selling Travor Brand RF-550d RF-550d studio flash light Brief Introduction Travor Brand RF550 Series ... reading and operation 7. Eight diameters of adapter rings for alternative use 49mm,52mm,55mm,58mm,62mm,67mm,72mm ... , 77mm8. Four colors of flash diffusers for alternative use orange,blue, oyster white, and transparent ...