How long?

[Oneputt]

Sliderr and I have been discussing the duration of a single flash from say the SB800. Does anyone know?

Also when you wind back the SB800 are you shortening the duration of the flash or reducing the intensity?

[Onyx]

http://www.dslrusers.net/viewtopic.php?t=12806

I'm sure a search on flash duration would have picked it up.

[frink]

From the SB-800 manual...

Flash duration (approx.)

1/1050 sec. at M 1/1 (full) output
1/1100 sec. at M 1/2 output
1/2700 sec. at M 1/4 output
1/5900 sec. at M 1/8 output
1/10900 sec. at M 1/16 output
1/17800 sec. at M 1/32 output
1/32300 sec. at M 1/64 output
1/41600 sec. at M 1/128 output

[Oneputt]

Thankyou Stephen. I guess there is a moral to this story.

[moggy]

The moral is...When all else fails RTFM.

Bob.

.

[Oneputt]

Spot on However reading it is one thing, understanding it another altogether.

[big pix]

oneputt....... you are reducing the intensity........ but if you also reduce your camera exposure to read the available light, and shoot at this read exposure along with the reduced flash you are doing flash fill.......... it is a balance of exposure and f stop along with the flash for a fill.

The speed that you shoot at does not have any effect on your flash exposure, only the available light of the area that you are shooting, the f stop does have an effect of the exposure of a flash, along with the exposure of an area that you are shooting, as does reducing the power of said flash......

[blaize]

Hi Big Pix,

That was an excellent answer as always and I must say put it all in perspective nicely for me..... now if only i can remember that for next time i play with the SB-800!!

cheers

Tony