Hey, the question was asked. The lower the output of the flash head the shorter the duration. Jonathan
-----Original Message----- From: Keith Whaley [mailto:[EMAIL PROTECTED] Sent: Saturday, December 11, 2004 11:31 AM To: [EMAIL PROTECTED] Subject: Re: flash duration jayers wrote: > Kevin the answer to your question is in Harold Edgerton's book > "Electronic Flash, Strobe" MIT Press. ISBN 0-262-55014-8 > Flash duration is a complex subject it is measurable and is a function > of capacitance and voltage. Voltage and its duration are easily measured > with an oscilloscope. C'mon, Jonathan...it's only "easy" if you know exactly what you're doing, and you have the equipment available! To the rest of the great unwashed, it's a subject that ranges from the borderline arcane to the incomprehensible! <g> keith whaley > T=RC/2 > T=time (microseconds) > C=capacitance in farads > R=E/Imax > R=resistance > E=initial capacitor voltage > Imax=Peak discharge current > > To use this formula we would need to know the specification of the flash > lamp. > > All this and everything you will probably like to know about high speed > light sources, and its application to photography is in this book. > This is a complex subject which Edgerton passionately studied, and > developed practical applications. He shared his knowledge with any body > that graced his door, and he has left us a great legacy in his book. > Jonathan > > -----Original Message----- > From: Kevin Waterson [mailto:[EMAIL PROTECTED] > Sent: Saturday, December 11, 2004 4:33 AM > To: [EMAIL PROTECTED] > Subject: flash duration > > Is it possible to measure the duration of a flash? > Possibly in micorseconds or something? > > Kind regards > Kevin >
