Howdy Shell...
If the filter were perfect for the yellow band, then the passage of yellow
through the filter would not be attenuated. Other colors, blue for example,
would be severely attenuated. Measuring a wheat field ready for harvest (no
sky) should show considerably less loss from the filter
For anyone interested in this thread, I put together a table of filter
factors for various Kodak films and Wratten filters. The information
came from Kodak's Professional Photoguide.
What is clear is that filter factors are not absolute, i.e., medium
yellow = a factor of 2.0, or one stop. Diffe
sures, a good understanding of how the filter
behaves in different light and with different films, may be required,
i.e., making a set of test exposures as one does when using a new film
for the first time.
William Robb wrote:
>
> - Original Message -----
> From: "Shel Belinkoff&quo
According to Kodak, that's not always true - it's not an absolute. One
of their publications on TX, for example, shows a different filter
factor for daylight and for tungsten. Recent experience shows the best
exposure (filter factor) does seem to vary with the light. IOW, one
stop isn't always
- Original Message -
From: "Shel Belinkoff"
Subject: Re: Using a Yellow Filter
> I understand that, but let's get back to one of the original
questions.
> If there is less blue in the light, which is what, in essence,
a yellow
> filter prevents from reaching th
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