Flash gun speed

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17 May 2008 - 11:01 AM

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cannyman

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17 May 2008 - 11:11 AM

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Quote: I know that camera has own flash sync speed for external flash gun, of lets say 1/250 sec or 1/300 sec.

Now, if I set the shutter speed on my 40D or say 1/1000 sec, is it still possible to use flash gun? How?

Ta.

Yes if you like a cut off picture. (showing curtain}

justin c

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17 May 2008 - 11:15 AM

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Hi Cole,
It is possible if your flashgun has a High Speed Sync mode. This will allow you to shoot at any shutter speed, although as your shutter speeds get higher, so the flashgun's range diminishes. The use of a flash extender helps somewhat in this regard.
Canon's 550EX and 580EX (to name a couple) have a High Speed Sync mode.

I find High Speed Sync invaluable, particularly for using fill in flash in bright conditions, and sold my older (but superb) Metz flashgun to change to a flash that had this mode (Canon 580EX).
Justin.

Chris_L

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17 May 2008 - 11:49 AM

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Quote: Yes if you like a cut off picture. (showing curtain}

Here's some info on high speed synch with Nikon and Canon flash LINK

Chris_L

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17 May 2008 - 1:16 PM

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Quote: The basic facts are, if you use a high speed shutter the flash has to be such a short duration it is almost useless

Have you pointed out these "basic facts" to the camera manufacturers who've took the time and trouble to develop and implement these features to save them wasting their time?

cannyman

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17 May 2008 - 1:53 PM

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Quote: Quote:........... almost useless.= not useless, it does have some use, you just need to be aware of how it works and what that means. bit like everything else in life

I quote METZ. This flash mode permits flash shots to be taken at shutter speeds faster than the flash sync speed which is expedient for portraiture IN A VERY BRIGHT AMBIENT LIGHT WHEN THE DOF IS TO BE LIMITEDBY A WIDE APERTURE OPENING.(eg f2) In other words a very weak flash.

justin c

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17 May 2008 - 2:10 PM

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Quote: In other words a very weak flash.

Which is perfectly adequate for fill in flash, hence the reason there is such a thing as High speed Sync mode.
It isn't useless at all, it's extremely useful in a lot of situations.

cameracat (e2 Member)

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17 May 2008 - 3:33 PM

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Quote: camera and gun will synch up to 1/8000th

Can confirm Mike, My D200 & SB800 will sync all the way to 1/8000's, Without any modifications to the pins......

Having said that the flash duration drops of a bit from 1/5000's upwards.....But you don't have any problems with the curtain halfway across the frame.....!

It's not a feature I find a whole lot of use for though.