At 15:03 10/23/02, Dan Mitchell wondered:
What are the neutral density filters for, though? Presumably it only makes
sense to use these in fully manual mode, because otherwise either the flash
(or TTL control) will try and compensate by firing the flash for longer, or
by keeping the shutter open longer -- so are they just if you want to barely
illuminate something?
I guess that makes sense, but I'm having a hard time imagining a picture
creation scenario that would _require_ a really wimpy flash, though. What am
I missing?
Dan,
Think macro with flash exceptionally close to subject because the camera
lens is exceptionally close. Using T-32's mounted around the lens for
something like the yellow-jacket shot falls into this category. It is a
"classic" and rather extreme example. Another would be close flash use
with human skin, especially pale Caucasian skin tones. Overpowered flash
will penetrate and reflect off of the blood in the capillaries creating a
reddish tone in skin highlights (been there; done that). By dropping power
level, the duration increases to maintain exposure but in my experience the
result is not as harsh with the reddish highlights.
Any situation with flash very close to subject material is a candidate for
an ND over the flash head to drop it's guide number.
-- John
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