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High Speed Sync- 1/250 vs 1/250* FP

Leonard62

Pa, US
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"RE: High Speed Sync- 1/250 vs 1/250* FP"

Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Writer Ribbon awarded for his contributions to the Nikonians Resources articles library Nikonian since 15th Mar 2009
Thu 06-Jun-13 09:46 PM

>Hi Len,
>
>Thanks for the reply. Yes- got it. But why have the option of
>1/250 without FP*? What is the advantage or benefit of having
>both?

Here is the explanation of High Speed FP sync by our resident flash guru Russ MacDonald.

http://nikonclspracticalguide.blogspot.com/2008/03/10-auto-fp-high-speed-sync-explained.html

The answer to your question in it's simplest form is as flash sync increases faster than 1/250 second, the flash output decreases until at 1/8000 second the flash is extremely weak. The reason for this is the focal plane shutter is not fully open at one instant at speeds greater than 1/250. At the higher speeds the FP curtain slit moves across the film (sensor) plane so the light output from the flash has to be stretched so it uniformly exposes the plane as the slit moves. At the lower shutter speeds the flash fires in a single burst that increases in speed as required. Flash output is uniform.

len


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A general, generic topic High Speed Sync- 1/250 vs 1/250* FP [View all] , dspvisuals , Thu 06-Jun-13 09:42 AM
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