Re: [APML] To hypo or hypersensitize...that is the question!

["John Boudreau" <jeboud@comcast.net>]

----- Original Message ----- 
From: "Brian larmay" <power_windows4789@yahoo.com>
To: "APML" <astro-photo@seds.org>
Sent: Wednesday, February 11, 2004 6:39 PM
Subject: [APML] To hypo or hypersensitize...that is the question!


> My girlfriend brought the word hypersensitize up in a
> darkroom class yesterday and the teacher laughed at
> her saying it was hyposensitizing.
> Needless to say it was her first day and she felt
> stupid.


Hi Brian,

The teacher was the stupid one. And your right that hyposensitize means to "unsensitize", not to increase sensitivity. To hypersensitize *is* the correct term for increasing sensitivity.

If he'll believe Kodak, have him look at the Tech Pan Publication P-255
http://www.kodak.com/global/en/professional/support/techPubs/p255/p255.jhtml
Look in Contents > Specific Applications > Astronomical Photography

Or have him do a web search on hypersensitizing film. He'll get overloaded with results ;o)

> This is the same guy who told me at some point sensia
> was the same film as provia except it was aged
> differantly for the mass consumer.

AFAIK, that's only true of Sensia 400. And that's only happened in the last 2 years or so. It was a different emulsion before then. The similarities now are about the same as E200 is to Elite Chrome 200 --- not *exactly* the same, but essentially so. In fact, the Fuji data sheet for Sensia 400 actually lists astrophotography as an application.


John Boudreau
http://home.comcast.net/~jeboud/astro.htm






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