Troy Reynolds

[WR <rivelli@xxxxxxxxxxxxxxxxxxx>]

Hi Troy-

The reason you are confused is because so many other people are confused
when it comes to using IR.

The recommended speed of Black & White Kodak IR films (HIE and HSI) is ISO
80 without a filter. This is the speed at which you would set a hand-held
meter. When you use the # 25 filter with HIE/HSI you need to give 2/3 of a
stop more
exposure, therefore the film speed would be set at 50 on your hand-held meter.

Now the confusion:

Since many people are using 35mm cameras with through-the-lens meters and
the meter has to read through the # 25 filter, you CANNOT SET THE METER FOR
THE TRUE FILM SPEED.

You have to experiment to find out where to set your camera in order to get
the same exposure as you would with a hand-held meter set at 50. If you
own, or have a friend with, a hand-held meter, take a reading and then
change the film speed settings on your camera so that it indicates the same
exposure. Most people find that a setting of between 200 and 400 works out
about right.

But please, remember: no matter where you set your camera, the film speed
is not 200 or 400; it is still 50.

Best wishes,

Bill


      William Rivelli
WILLIAM RIVELLI PHOTOGRAPHY

rivelli@xxxxxxxxxxxxxxxxxxx
    www.rivelli-william.com


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