[LargeFormat] Pre-exposure in the real world

[Bob Younger]

We did this for real, in the field, at the workshop with Ansel I attended in
'79. It works just fine in the field. Use two pieces of opal (milky white)
glass in front of the lens (large enough to cover the lens). Some folks had
a spacer between the two pieces so that they could slide an ND filter in
there if necessary. Determine what degree of pre-exposure you desire; meter
through the glass (of course), and set your lens appropriately.

Somewhere along the line I recall (perhaps incorrectly) some discussions
about pre-exposure only being valuable (having an effect) for some finite
amount of time following the pre-exposure. Don't recall if it was weeks,
days or hours.....maybe others can add to this.......

Bob Younger
San Diego, CA



----- Original Message -----
From: "Lee Carmichael" <click76112@charter.net>
To: <largeformat@f32.net>
Sent: Wednesday, January 02, 2002 8:02 AM
Subject: Re: [LargeFormat] Pre-exposure in the real world


> I, too, have read about this for many years.  I have never done it.  I
have
> always relied on the tried and true N-1 exposure or development to control
> scene contrast.
>
> lee carmichael
> click76112@charter.net
>
> ----- Original Message -----
> From: "Cindy and Marco Milazzo" <mmilazz1@elp.rr.com>
> To: <largeformat@f32.net>
> Sent: Wednesday, January 02, 2002 9:10 AM
> Subject: [LargeFormat] Pre-exposure in the real world
>
>
> >
> > I said I was full of questions about practical issues.  Here's my first
> > one:
> >
> > In his books, Ansel Adams advocates pre-exposure as a way to control
> > contrast and punch up the darker values. I've tried it, and it works,
but
> > it's somewhat dificult to accomplish in the field.
> >
> > Do any of you pre-expose, and if so, how do you do it? Are there any
> > tricks or gadgets that help?
> >
> > TIA
> >
> > Marco --