However, now you can use wide apertures to isolate your
subject in direct sunlight—which requires high shutter speeds.
The flash will adjust and provide great fill light, if you’re
using Auto FP high-speed sync mode.
One thing to note: If your flash fires at full power in normal
modes, it will blink the flash indicator in the Viewfinder to let
you know that all available flash power has been dumped, and
you need to check to see if the image is underexposed. When
the camera is firing in Auto FP high-speed sync mode, that
doesn’t happen. You’ll get no warning in the Viewfinder if
the image does not have enough light. Check the camera’s
histogram often when using Auto FP.
Special Shutter Speed Setting X + Flash
Sync Speed
When using exposure modes Manual (M) or Shutter-priority
auto (S)—if you crank the shutter speed all the way down to
30 seconds, then to bulb—there is still one more setting
below bulb, named X + Flash sync speed. This special setting
allows you to set the camera to a known shutter speed and
shoot away. You will see X 250 if Custom Setting e1 > Flash
sync speed is set to 1/250 s. Whatever Flash sync speed you
select will show up after the X. If you selected a Flash sync
speed of 1/125 s, then X 125 will show
up as the next setting below bulb. Selecting a Flash sync
speed of 1/60 s means that X 60 will show up below bulb, etc.
The shutter speed will not vary from your chosen setting. The
camera will adjust the aperture and flash when in
Shutter-priority auto (S) mode, or you can adjust the aperture
while the flash controls exposure in Manual (M) mode.
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