when u set the flash to slow sync mode,the shutter will drop to the ambient reading.not necessary just 1/30s,it can drop slower to 1/8s or 1/4s or even a few second to if the ambient is really dark.
at F4 ISO 640,if u use the slow sync mode on ur flash,it will definitely be slower than 1/30s,maybe 1/8s..
Can u safely say u can handhold and get good results using slow sync flash ?
i would prefer to shoot at the slowest speed my hand can hold using normal flash in stead of setting the flash to slow sync.
i believe they call it dragging the shutter..
at F4 ISO 640,if u use the slow sync mode on ur flash,it will definitely be slower than 1/30s,maybe 1/8s..
Can u safely say u can handhold and get good results using slow sync flash ?
i would prefer to shoot at the slowest speed my hand can hold using normal flash in stead of setting the flash to slow sync.
i believe they call it dragging the shutter..