Hey everyone I have a slight problem I'd like some help with. I haven't done any recently, but a couple of months ago I did a photoshoot with a model I know at the beach during sunset but the photos didn't exactly turn out the way I wanted them to. I think i've figured out my problem now but at the time I was using a SB-600 as my main light. At full flash power, the photos either came out underexposed: or I'd get only half the subject lit: My goal was to get the subject exposed properly and the background underexposed but as you can see I didn't achieve either. I'm using a D90 and the flash sync speed on it is 1/200s, and I was shooting these pictures at 1/400s and 1/320s with an f stop of f3.5 which I think is my problem. Since my flash sync speed is 1/200s that means the maximum shutter I can shoot at is 1/200 right? And I have to underexpose the background by adjusting the aperture correct? Thanks.