[LargeFormat] F.S. 50-Sheet Box Tmax 100 8x10

[Richard Knoppow]

----- Original Message ----- 
From: "Frank Filippone" <red735i at earthlink.net>
To: "f32 Large Format Photography Mail List" 
<largeformat at f32.net>
Sent: Wednesday, February 23, 2005 6:54 AM
Subject: RE: [LargeFormat] F.S. 50-Sheet Box Tmax 100 8x10


>I may be a bit dense, but I want to be clear on this..... 
>The UV inhibitor
> is in the film so that when you TAKE pictures, the UV is 
> not recorded/  Is
> this correct?
>
> The other interpretation is that the UV inhibitor is in 
> the film BASE so
> that when you try to PRINT the film onto contact AZO 
> paper, the film base
> blocks the UV light.  Making prints hard to make.
>
>
> Which is correct.... the differences are rather great.....
>
> Frank Filippone
> red735i at earthlink.net
>
    T-Max is supposed to have a UV inhibitor in the 
emulsion. My test was of roll film and showed that developed 
film did not pass as much UV as other roll film. This should 
not affect Azo unless you are exposing it with a UV souce 
such as a Morse aerial film printer. Azo and other graded 
papers are sensitive mostly to visible blue.
    My test may not be valid for materials like platinum 
prints. I simply looked at the amount of flourescence of 
writing paper with brightener in it when illuminated by UV 
light coming through the clear parts of negatives on several 
kinds of roll film.
 ---
Richard Knoppow
Los Angeles, CA, USA
dickburk at ix.netcom.com