Re: 18% gray card question

["R. C. Lacovara" <lacovara@xxxxxxxxxxx>]

If all else fails, I suppose that one could make an IR 18% gray. If you 
could find a good IR black (laser jet toner? dunno, have to check) and 
estimate the reflectance of white bond paper, I suppose that you could 
print a fine pattern, and expose it out of focus...

Bob

At 01:43 PM 3/2/01 -0700, you wrote:

>Hello all -
>
>I've been doing some Zone system calibration on
>non-infrared B/W film, and would like to use some
>of those techniques with IR film.
>
>But I have one question - does anyone know if a
>Kodak 18% gray card is still 18% gray in the range
>of IR, say 650-900 nm???
>
>Thanks -
>
>Joel.
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