I'm new to using flash--always been a natural light kinda guy. But even
old dogs want to learn new tricks sometimes. I've read about this a few
different places, but somehow still not convinced I completely get it.
OK, so let's say I'm outdoors shooting a portrait against the sun. I
want to use fill flash. Is this how I would do it?
1) With an OM-4ti...
a) Let's say I have a T32 flash.
I switch the camera to auto, set the flash to TTL. I meter the ambient
light, set the aperture for a value that allows a shutter speed of
1/60th or less. Let's say I'm using Reala, and f11 works. ASA100,
1/60th @ f11. (But does the 4ti automatically switch to 1/60th?) I
change the _ASA_ setting (not exposure compensation) to ASA 200. Take
the photo. This gives me a fill of one stop under ambient light. Right?
I can dial in any amount of compensation this way actually, in 1/3
stop increments, up to the limit of the ASA wheel. OR...if I know I
want TWO stops under, it looks like the T32 has a 1/4 power setting.
Right? Or is there a simpler way (I hope)? I think what's confusing
for me is how the TTL-OTF flash, and auto mode of the camera, interact.
b) Another flash with 3 auto apertures-- say 2.8, 5.6 & 11.
I meter ambient light. For flash one stop under ambient light, I choose
an aperture on the camera that's one stop smaller than one of the auto
apertures on the flash. Let's say f8 at 1/60th works for ambient light.
I change the flash to its auto setting of f5.6. I can vary the ratio of
flash to ambient light by the difference between the auto aperture on
the flash and the camera aperture--# of stops camera aperture is
smaller than auto aperture on flash = # of stops less flash, more
ambient light. In this case, a flash that offers a large number of auto
options is quite useful.
2) With an OM-1...
a) same as "1b" above, or...
b) with flash on manual setting, do the guide number/distance =
aperture calculation, then either cut the power in half on the flash
(for one stop under), or choose a one stop smaller aperture on the
camera that still allows proper exposure of ambient light.
Whew.
Please, enlighten me if I'm totally off on this. I'm going to try
shooting a roll of slide film to test these approaches, thought I'd run
it by you all first.
Cheers,
Rob Harrison
Seattle
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