Kho King said:slow sync = flash + original speed (exposure setting) as if without flash.
showtime said:need it be original speed?
a shutter speed that is faster than the original metered shutter speed will still be considered slow sync if it this shutter speed is less than flash sync speed.
correct me if im wrong.
for example.
ambient light gives f2.8 1 second.
shooting at f2.8 1/15 (not the actual shutter speed) is considered slow sync.
assuming you are shooting with a F100 which has a flash sync speed of 1/250
this concept is well described in the article that kira posted
showtime said:thanks for replying so fast...
yep... my F80 has sync of 1/60 to 1/125...
wish i had something better though... fill flash in day time is a pain for me...
showtime said:i think i have got you confused....
i have a sb80... but the problem is that with the 1/125 sync speed, my apperture has to quite small to aviod overexposure... so i cannot get the nice blurry background with the portraits i shoot.
with a sync speed of 1/500, i have 2 stops more on apperture... tada!!! more blur backgrounds!!!!!
showtime said:yep i shoot in A mode...as well as ttl flash... but matric metering...
but i think no diff as the face is very bright too
i try to keep the appertures as wide as i can but the F80 will give a high notification... so i have to stop down...thus no blur effect...
my fill flash is used not so much to light up a dark face, but rather to soften the shadows that have been cast by natural lighting...
showtime said:hmm i think whatever mode i were to use, if the ambient light is bright, i will have this issue...
i can use manual mode... and overide all the cameras recommendations. but the story still stands that to large an apperture with the slow 1/125 speed will result in overexposure in bright light...
but thats an idea for a high key lighting shoot....
haha everything whilte and only eyebrow hair, lips will be dark. can just imagine it...
use a ND +4 filter?showtime said:i think i have got you confused....
i have a sb80... but the problem is that with the 1/125 sync speed, my apperture has to quite small to aviod overexposure... so i cannot get the nice blurry background with the portraits i shoot.
with a sync speed of 1/500, i have 2 stops more on apperture... tada!!! more blur backgrounds!!!!!
wacko said:use a ND +4 filter?