Invisible light

[John Bright <bright@xxxxxxxxxxx>]

IR people,

I have a need to use infrared flash. That is, I want my flash to be
invisible to the naked eye. I have successfully used a #87 for this
previously.

But what I want to determine is which filter will transmit the widest range
of infrared light, but which is still invisible to the naked eye. I am
guessing that maybe an 89b would work. Or maybe a 70? Does anyone know? It
is OK if the end of the flash glows red, I just don't want the rest of the
light to be visible.

Also, I really would like to try the Ilford film because, unlike most of
you, I want a film which is sensitive to lower wavelengths of light and
will not give such an infrared look.

Thanks,

John Bright


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