[LargeFormat] Pre-exposure in the real world

[John D. Clark]

    I've used pre-exposure quite a lot on my last field trip -- I used a
piece of frosted white plexiglas to pre-expose in the field.  You can
pre-expose before going out, but that means carrying more film holders -- I
ended up waiting so much for contrails to disperse there was plenty of time
to pre-expose before making the picture.

    Another thing to keep in mind that there's a difference between N-1
development and pre-exposure.  N-1 development compresses the tonal range,
more at the top end to provide a printable range.  Pre-exposure doesn't
change (to a measurable amount) the local contrast in the highlights, it
adds density in the shadows.  You can also pre-expose to any Zone -- I used
Zone III pre-exposure during my last field trip.

    The pre-exposure charts on the Zone System tutorial web pages are a
great way to understand how it all works:
    http://carbonphoto.cicada.com/zs/chapter8/d.html

    JDClark

----- 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 --
> > On an overcast El Paso morning
> >
> >
> > _______________________________________________
> > LargeFormat mailing list
> > LargeFormat@f32.net
> > http://www.pairlist.net/mailman/listinfo/largeformat
>
>
> _______________________________________________
> LargeFormat mailing list
> LargeFormat@f32.net
> http://www.pairlist.net/mailman/listinfo/largeformat
>
>