RE: [APML] Tech Pan Developing Q

[Kirk Carbo <kcarbo@lobosservices.com>]

Negative intensification with selenium toner is not a new technique.  Fine
art B&W photographers have used it for years.  The View Camera Store has a
news letter called D-Max.  One of the back issues covers the technique well.
Go to viewcamerastore.com under books and videos.  Call Dennis on the phone
and he will refer you to the correct edition.  Time recommendations for
negative intensification with selenium are similar to development.  They are
starting points and should be tested. I would recommend testing different
times on a few test negatives since the effect is permanent.  
These guys are experts at controlling contrast on B&W films.  They sell an
excellent book on the subject, Beyond the Zone System,  by Phil Davis.

Kirk Carbo

> -----Original Message-----
> From: Brian Larmay [mailto:astrobri@ameritech.net]
> Sent: Wednesday, May 07, 2003 8:14 AM
> To: astro-photo@seds.org
> Subject: [APML] Tech Pan Developing Q
> 
> 
> Hi,
> 
> I was talking to a photographer about storm chasing 
> photography using BW
> film and she said something that I thought might be interesting for
> some....here is a snip from her response to some gweneral questions:
> 
> 
> <snip>
> 
> Another good option for increasing contrast without 
> increasing grain size of
> the negative would be to selenium tone the negative (a type of
> intensification) in a 1:3 dilution of Kodak Selenium toner 
> and water, for
> about 5 minutes, after complete fixing. Wash thoroughly after 
> this. Keep in
> mind that most of the contrast increase will be in the 
> mid-tones through
> highlights, so you want to make sure your cloud mass is exposed bright
> enough on the film.
> 
> <end snip>
> 
> Ok..
> So has anyone tried this or thought of this?
> Any thoughts to how this might add or degrate to tech pan astrophotos?
> 
> Brian
> 
> 
> My Photography
> Homepage: www.astrobri.com
> Nature: http://www.astrobri.com/nature_photography.htm
> Astrophotography: http://www.astrobri.com/astrophotography_ind.htm
> Storm chasing photography:
> http://www.astrobri.com/weather_pictures_2002_season.htm
> Northern Lights: http://www.astrobri.com/northern_lights.htm
> Miscellaneous: http://www.astrobri.com/miscellaneous.htm
> 
> 
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