Re: [APML] how to test for base fog?

[Jerry Lodriguss <lists4@astropix.com>]

>I disagree somewhat.
>The usually accepted target base fog density for hypered Tech Pan film is 0.6.
>This means that the density of an unexposed but developed area of the film 
>reads 0.6 on a transmission densitometer. To the eye it appears more than 
>slightly grey.


The base fog density also will depend on the type of vacuum used in the 
hypering process. You get less for and more hypering with a true high vacuum.

Also, it will depend on what developer you use and how long you develop it.

Jerry


_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo