[pure-silver] Re: Pre-Exposure of Negatives

On Jul 17, 2006, at 9:45 AM, Ralph W. Lambrecht wrote:
Has anyone used this technique with success? I like to find out what you
used it for and what materials you worked with (from film to paper). Did it
work? Would you recommend it? Was it easy to control? etc
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com

If you are referring to a slight pre-exposure of to raise the speed of the film by pushing it closer to the threshold, I remember it as taking just barely exposed pictures of an out of focus gray card on a whole roll of film (35mm) them rewinding and shooting again.

I did it, it worked, and I'm sorry can't remember any more details.

  It's easier to do with sheet film.

For 35mm It's easier to do with a Contax or similar camera that spaces (indexes) the frames with greater accuracy.

I vaguely recall it taking just a few experiments to get right and make it repeatable.

There was a preproduction version of a 35mm camera that had LED's to slightly expose the film right near the shutter curtain to make the film more sensitive for low-light shooting.

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