Somebody said in a previous post:
> Well, at full power, a flash strobe is usually quite slow. Somewhere
> around 1/150s.
<<<<< snip >>>>>>>
> Consequently, a standard subject should be frozen by the flash if not
> too rapid, but a common speedlight cannot be used at full power to
> freeze fast action like water drops...
Based on the above and the SB-28 manual, Thierry did some postulating
about flash duration.
The original poster's info (1/150 second) is probably good for SOME
flashes, but not the ones I commonly use. The SB-26 has a max duration
of 1/1000 sec. and min duration of 1/23,000 sec. The SB-28 has a max
duration of 1/830 sec. and min duration of 1/8,700 sec. (These figures
are from Thom Hogan's most excellent "The Nikon Field Guide").
The original poster's advice about how to freeze the action of water
drops is still right-on, you need to use the flash (in auto or reduced
power manual) such that the duration is at the lower end.
Thierry's theory looks like it's mixing high speed sync (or FP) tables
in with conventional flash, and I think that's not a valid comparison.
To get to Thierry's basketball question, the SB-28 flash output is
always going to be faster than 1/830 (or faster than the 1/500 he
required), so the flash will freeze the action. The trickier question
is whether there will be enough ambient light to render the basketball
player as a blur. Lighting will vary from court to court, but using the
max (conventional) sync of 1/250 should minimize any ambient blur.
-Todd
--
Todd & Sharon Peach
Seattle, Washington
[EMAIL PROTECTED]
http://home1.gte.net/tpeach/NoPlaceLikeHome.htm
