Altura Photo Universal 4&rdquo;x 5&rdquo; Softbox Flash Diffuser (Including Canon Speedlite 430EX II 580EX II 600EX-RT, Nikon SB-900 SB-910 AF SB-800 AF SB-700, Yongnuo YN560 II YN560 III YN560 IV and Other External Flash Units)