As soon as you go past 1/320s you will lose a huge amount of flash power. I shoot at 1/320s to get the maximum flash power and shortest shutter speed possible, which is important with ambient sunlight images. _________________________________ Neil Nikonians Team My Gallery
Tue 29-Sep-09 03:19 AM | edited Tue 29-Sep-09 03:19 AM by MichaelAlan
>As soon as you go past 1/320s you will lose a huge amount of >flash power. I shoot at 1/320s to get the maximum flash power >and shortest shutter speed possible, which is important with >ambient sunlight images.
You are 110% correct about losing huge amounts of flash power... However, using FP flash (AKA high speed sync) allows you to shoot wide open with your lenses so in essence, you do manage to get "most" of that light back.
If you were shooting without FP (say a generic speedlight in Manual mode off camera triggered with a PocketWizard) then you may be in need of shooting at 1/250" at f/11 to expose your subject properly. 4 AA batteries cannot put out f/11 power unless the subject is basically right on top of the flash.
With high speed sync, we can dial our aperture down to f/2.8 (or lower if need be-lens permitting) and gain an extra X stops of light in the aperture department. That would allow us (in FP sync) the ability to shoot at much faster shutter speeds.
Remember, the flash power, flash to subject distance, ISO and Aperture control the amount of presence your flash has in your image. All the shutter speed does is dials down the ambient.
Fri 25-Sep-09 02:45 PM | edited Fri 25-Sep-09 02:48 PM by Donald Kahn
According to one of the authors of "Mastering the Nikon D700," James Johnson and Darrel Young, there is no downside to using 1/320 FP. I don't have the book in front of me, but as I recall he mentioned that you would be ready to shoot fill flash in a brightly lit situation such as at the beach. He said that he uses that setting on his D700, so I set it for the same on mine.
Yeah! That doesn't make sense to me either. I'm no flash expert either, but....
It has been pounded into me by now that SS controls the ambient portion of the exposure, and Aperture controls the flash contribution. So....if thats true, then why would bumping the SS from 1/250th to 1/320th burn up huge amounts of flash power.....Does not compute.......