Slow sync / red-eye reduction flash question?

[epic_laydown]

this is used with a dark background, that slows the shutter speed so the background becomes brighter, and reduces red-eye phenomenon. Are there any other uses for it?The flash goes off initially, and the shutter stays open for up to 1 second. Have you found this useful and are there a lot of uses for it. Thanks.

[victor98_2001]

Slow sync for using flash photography and when you are using dark background ,it will be the same quailty.Red-eye reduction for flash,that means you are taking too direct to an eyes will cause this problem. The flash goes off initially, and the shutter stays open for up to 1 second,I think you are taking firework or night scenes without a person.

[Michael U]

The techniques are related - but different!Slow synch is just a longer shutter speed that enables the background light to bleed in to the shot - implicit in this longer shutter speed is some blur in the back ground (implying panning or camera rotation - the flash helps to freeze the subject movement)... usually successful at around 1/4 or 1/2 second (depending on your background lighting).Red eye reduction is just that (not slow synch)... a series of pulses or pre flashes from the flashgun persuade the subjects pupils to close (which helps to prevent the blood vessels at the back of the eye from being illuminated (causing a red glow)... so red eye reduction is NOT about blurring backgrounds per se and the anti red eye flashes are often 'pre flashes', not indicative of a longer shutter speed!There are quite a few uses for slow synch flash: discos, bands, even fashion and corporate work - it's just another technique for the armoury and on that basis it's useful for clients who are looking for something different.