RE: [APML] unhypered TP density?

["Chris Schur" <cschur@cybertrails.com>]

Chuck, but after hypering, a density of .25 to .3 is expected for about 4 to
6 minutes in D19, agree?

Chris Schur

Astrophotography: http://www.psiaz.com/schur/astro/index.html


-----Original Message-----
From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
Behalf Of Chuck Vaughn
Sent: Tuesday, April 23, 2002 7:06 AM
To: astro-photo@seds.org
Subject: Re: [APML] unhypered TP density?


Torsten,

> I'm also playing around with hypering TP. Here's a question that hopefully
> someone can give me a precise number for...
>
> What should the density of unhypered, unexposed TP (35mm) be when
> developed for 9-10 minutes in D-19? I had some of my test strips checked
> at the photo lab on a densitometer, and they were in the range 0.22-0.24.
> This seemed quite dense for unhypered/unexposed film. Is that ok?

No, that's not okay. I used to make slides of B&W negatives on unhypered
TP and the unexposed frames are practically clear after 10 mins in D19.
I've got a piece of "hypered" TP that was measured at .11d. If you're
getting .22d then you have a problem.

Chuck <aa6g@aa6g.org>


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