Some thoughts on HIE and UNDERWATER cameras

["Thomas H. Hogan" <flzhgn@xxxxxxxxxxxxx>]

>Does anyone have any experience with underwater photography and HIE. I am
>planning a snorkeling trip and want to try something new. I am also
>considering taking a flash with an opaque 87 filter so as not to scare the
>fish. This is a once-in-a-lifetime chance and any advice will be
>appreciated.

Since I've used HIE film in an underwater camera -- here are
some thoughts.
The camera I used was a plastic Canon Aqua Snappy it is made out of
plastic.
NOTE:  The HIE film must be loaded into the camera in the dark.
I use a black film change bag (double zippers, rubber lined about $18)
to 
load the film.  It is awkward, especially on a boat.  I am not sure if
my
plastic camera is completely infrared opaque.  Make some tests ahead of
time!

I have never noticed a fright reaction in fish due to flash, but most
fish have 
excellent color vision which extends to the far red but not to the
infrared.
There is some far red light in extremely shallow water but almost no
infrared.
Infrared light is absorbed by H2O almost immediately and visible red
light
is completely absorbed in a few meters.  

How about using color infrared film?  It's hard to get developed but the
results might be very interesting.  

Can you bracket exposures with your underwater camera ??
There is plenty of ultraviolet and blue light to a considerable depth.

Have a great adventure --

Hank

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Topic No. 4