Re: Re:Critique on infrared article and more questions

["Christina Z. Anderson" <tracez@xxxxxxx>]

> The 15, an orange filter, produces the same result as a 25 with Konica
750nm film
> because the filter is allowing though some wave lengths starting at about
505nm
> that the film can't "see" anyway.  Your meter, if metering through the
filter, will
> see it, but the film won't.  (I once saw a recommendation in a book to use
the
> orange rather than the red filter with this film in order to gain a stop
in
> exposure.  A look at the film's bi-modal sensitivity curve points out the
book's
> error faster and easier than testing does.)

Bob, please explain this last statement:  if I understand you correctly,
there is no difference between the two filters with Konica anyway, blind as
it is to yellow and green.  But are you saying that there is not an extra
stop of exposure available then because of the filter's lower exposure
factor?  I do have this exact statement you qute above from that book
reprinted in my infra article so if you can be more specific I will take it
out.
Chris

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