Al,
D50 flash sync speed is MAX 1/500 sec. Any value at or below that can be set but not higher. Currently on full bore your flash duration is 1/1100 sec. I hope the attached graphic explains the logic of sync speed. On any flashgun as the power is turned down the flash duration is shortened. I will read up on the SB24's SB25's & SB26's to see what you will gain.
Don
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