Pre and Post Exposure Question

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Christoper

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Joined
Aug 23, 2009
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16
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Western, Ore
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4x5 Format
I have heard about using either a pre or post exposure with color film to control contrast. I would like to try it.

Has anyone here done this? I need techanical info.

(Note: I do 4x5 view camera, both positive and negitive color film, I have a Pentax Spotmeter V exposure meter)

Thanks
 

keithwms

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Oct 14, 2006
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I have pre-exposed slide film to control contrast, it work well enough. You simply aim it, out of focus, at something uniform and featureless (e.g. the sky, some concrete, a piece of paper) and expose it 3 stops faster than your main exposure will be.

There is a calibrating gizmo (expodisc), normally used for white-balance control, but you can put one on your lens and preflash with it as well:

Dead Link Removed

(You could make yourself an expodisc out of something translucent)

You could also preflash your slide film in the darkroom.

I never tried preflashing c41 films, since they have so much range anyway. If I really expected problems with contrast I'd simply rate the film at box speed or a wee bit faster, and/or use a graduated neutral density filter, etc....
 

removed account4

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Jun 21, 2003
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hi christopher

to build upon what keith suggested ..

(there was a url link here which no longer exists)

it has been years since i posted that thread
and i haven't done it yet :wink:

good luck!

john
 
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