Hi guys I hope someone can help me, I just bought a sb-28 flash, and when I choose the manual mode, it asks me to set up everything, ISO, ZOOM, APERTURE, so my question is how iso will affect here?? i turn iso 100 or 400 and same results ofr each setup.....I dont remember my 580ex having this option, actually I only switch the power and the zoom when using manual mode....
Note, im using this sb28 as OFFcamera flash...
thanks!

