Light painting would almost seem to be the obvious choice.
Rand E.
P.S. During a recent cave trip I found the Oly 40mm f2.0 to be very good.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Andrew Fildes wrote:
> John
> Long exposures, tungsten film, mechanical camera, good light meter -
> Lunasix for instance will give long exposure readings.
> If time is limited, go down beforehand if possible and take some
> readings.
> Ask if you can borrow some of the battery powered safety lights (hat
> and belt units) perhaps for additional light.
> They aren't powerful but will give some spotlighting.
> Doesn't look like you'll be able to do much more than 'dark and
> moody' shots.
> You won't be able to light up a whole gallery so go for the
> claustrophobic stuff.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 11/10/2007, at 4:05 AM, Geilfuss Charles wrote:
>
>> Perhaps if you knew the wattage of the existing lights, the
>> average width of the mine passage and distance between lights it
>> may be
>> possible to estimate the needed exposure. There must be some
>> formula to
>> use if you know the output of the light source and the area of the
>> illuminated space. Of course I'm only good for the theoretical
>> work; the
>> number crunching would have to be done by someone else. ;^)
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