Hi Bob,
Colour casts from artificial lighting will only affect your picture as
your exposure setting gets closer to the ambient light level.
E.g. Lets assume you set your shutter speed to 1/125 and a correct
ambient light reading gives an aperture of f5.6. With your flash in TTL
(ATTL, ETTL etc) mode if you set your aperture to f11 the subject will be
correctly exposed (in natural colours) and the background will be 2 stops
under-exposed and almost black. If you set the aperture to f7.1 the
background will be 2/3 underexposed, so you will see some detail but the
colour cast shouldn't affect your picture as it will be 2/3 stop below the
light put out by your flash.
Setting your flash to +1 simply means that you're overlighting your
subject by 1 stop, and this will have to be compensated for in printing, by
darkening the whole image, which results in dark backgrounds. You can get
away with this on neg, but on tranny you'ld simply have an overexposed
subject.
Another way round might be to put a filter over your lens (I'm not sure
which one, but Jessops should know) and a strip of sodium corrective gel
over your flash. This means that both the ambient lighting AND the flash
output will match, and you can shoot as if under daylight conditions. If it
was tungsten lighting, you could use special tungsten balanced film and just
put a tungsten balanced gel over the flash.
----------------
James McCauley
email: [EMAIL PROTECTED]
portfolio: http://www.jamesmccauley.com
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