Hi bros and sis, sorry newbie here. 请您多多请教. Wanna know if there's another reason besides softening an image taken with the built-in flash, that means the image taken with a flash is not so "hard" and bright. So is this the only reason why people buy external flash? What other reasons are there? Because thinking of buying a SB-600 for my Nikon D40, so wanna find out first b4 launching into it. Thanks very much in advance.