Re: Underwater IR

[Jon <mr645@xxxxxxxxxxxxxx>]

In a message dated 2/21/98 10:01:46 AM, you wrote:

<<Has anyone tired to use IR film underwater? I have a Nikonos IV and
was
thinking of trying it with IR film underwater - I usually set my camera
to
1/125 to 1/250 at f16 through a #25 filter. I though that if I used the
setting of 1600 ASA (to compensate for the 3 stops of loss through the
filter) at f 11 and f 16.>>


First, a three stop loss would equal something in the range of ISO
25-50.  Going up to 1600 is the wrong direction.  
  I would think that IR light would be heavily filtered by the water,
but  the only way to know for sure would be to try.  I would think that
Ektachrome EIR could give you some really wild results.  I would love to
see some tests of that film underwater.  I first suggestion would be to
heavily bracket.  I find that an in camera reading, through the red
filter with a setting of ISO 200 works well above water, but I would try
setting 100 and 50, perhaps even 25 and see what you get.


Jon
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