Re: flash duration

[Graywolf]

Color tempurature is determined by the gas used in the flash tube. A Xenon mix 
is normal. It fluoresces at approximately 6500K. Most have a bit of filtering in 
the protective flash cover to cut off the UV and lower it to about 5000-5500K.

graywolf
http://www.graywolfphoto.com
"Idiot Proof" <==> "Expert Proof"
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Bob Blakely wrote:
This is just my wild ass guess, so you see if it makes sense...
For a given flash tube, the color temperature will be will depend on the 
power in the tube. If this is so, then the only way to change total 
flash energy without changing color temperature is via flash duration.

Regards,
Bob...
From: "Thibs" <[EMAIL PROTECTED]>

I seem to remember I read a couple years ago (so maybe it concerned 
old analog TTL) that some flash TTL systems were based on power 
variation when others were based on duration variation and of course 
everybody used one with Pentax alone using the odd one =D

I guess that modern system are bit of both.