Re: [APML] Tech Pan 120 Hypering, Kodak Response.

["Jeff Crilly" <jlcapml@sbcglobal.net>]

I thought one of the "other" issues with hypered techpan
was the problem of film curl.  Hence a vacuum back was sorta
needed, which requires removing the paper.

Why not just remove the paper from the 120 techpan, hyper it, 
and use the camera on the 220 setting?  (whether or not the
vacuum back is in use.)

(Too bad its not available in a 220 format.)

Btw, from the Kodak website techpub on 2415...

> You can use these films for stellar photography, but first 
> hypersensitize them with forming gas or silver nitrate to 
> improve the film response with the long exposures required. 
> (For information on hypersensitization of Technical Pan Films, 
> see the American Astronomical Society Photo-Bulletin, 
> Issue No. 24, 1980, No. 2.) "

Sounds like "intended use" to me.

----- Original Message ----- 
From: "Jason Ware" <jtw@galaxyphoto.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, June 28, 2004 6:28 PM
Subject: [APML] Tech Pan 120 Hypering, Kodak Response.


> 
> Received a voice mail today regarding the bleed through
> problem on 120 Tech Pan. Search this forum for the letter,
> data, and samples I sent them. 
> 
> In a nutshell....
> 
> Thank you for sending the samples and data.
> You are using the film outside of the parameters
> of its intended use.
> We expect this problem not to appear when the film
> is used as intended, however, we will review our
> manufacturing procedures to see if we can correct the
> problem in future production.
> 
> I'm not waiting, I modified my old graflex back to 
> use cut 4x5 film clips. By by 120 tech pan for me.
> 
> -- 
>  -Jason Ware 
> 
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