<<
I'm not sure how the flash sync works; but if the flash is only 1/500th
let's say, am I basically shooting at that shutter speed due to flash
exposure time length?
>>
It depends on the ambient light.
Let me provide two (extreme) examples.
1) The correct exposure (without flash) is 1 second. With flash you use
1/60, that is 6 times less, so with this speed the only light source is the
flash, and the "real" speed is the flash duration.
2) The correct exposure (without flash) is slighty longer than 1/60. In
this case the flash fires, but the light needed from the flash is very
little. So although the flash provides a very short output (maybe 1/10000),
you are basically shooting at 1/60. With ambient light good for 1/30, the
problem is even worse: the flash freeze the image, but you could have a
gosth (only 1 stop of underexposure) from the ambient light.
Ralf Loi
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