Q: For those asking for higher flash SYNC.

Started Feb 1, 2004 | Discussions thread
Michael Grøn Junior Member • Posts: 43
Re: Wrong, Michel Gron...Thanks for putting me right (nt)

jean bernier wrote:

Michael Grøn wrote:
Yes, I have wondered about that, too.

For studio work, although the flash sync speed is 1/125, the flash
burst is mucher faster/shorter, making it sync speed irrelevant in
this respect. Or am I wrong?

Mr. Stacey, wrote:

Is this so you can take pictures outside?



-- hide signature --

...been b@nned 7.5 times and counting!

-- hide signature --


Yep, you're wrong regarding studio flashes. Many studio flashes
have flash duration as low as 1/100th of a sec at full power, with
lower output flashes being progressively shorter. The fastest one
gets on some models is 1/1000th at low setting. So actually, a
short exposure such as 1/250th DOES cuts off a good section of the
biggest burst leading to an under exposure. A good flashmeter does
measure the flash burst at a simulated shutter speed. Early models
only measured the full flash duration regardless of shutter speed.
One had to compensate with diaphragm whenever cutting off part of
the burst was expected.
Most on-camera flashes have short-enough bursts so that it is
irrelevant to correct. Typical Nikon flash: 1/1000th at full pwr,
1/23000th at minimum pwr. Auto and TTL give anything in-between.
HI speed sync is useful for fill-in outside work, mostly, so that
you're not stuck out-of-stops, or f:22, an aperture most demanding
for your flash BTW...
Happy shooting JB

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