what aperture to use with external flash

[chocolate]

hi all

what aperture do you use when have your external flash on?? e.g day time and night time.

i am using d80 and sb600. i find that when i use maximum aperture e.g f2.8 with my external flash.. all i get if overblown photos..
but when i changed to f8. it turns out quite nicely.

i want to learn a bit more abt aperture with flash but cant seem to find much.

is there a good book or some more experience photogs here can help ??
how do you know what aperture is best with flash (TTL) on>??


thanks for help in advance.

 

[Flash Harry]

with any flash the aperture is related to Flash to subject distance and power, it depends on how high the flash output is, if you want to use a wider aperture either move the flash further from the subject or reduce the output power, personally i leave the flash at full power and adjust the aperture accordingly, I control DOF by moving camera position closer to subject or use a longer focal length lens. H

 

[reg]

Strobist: Guide Number - Your Free Flash Meter

In fact, read the whole site.