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[OM] exposure comp. for non-grey scenes

Subject: [OM] exposure comp. for non-grey scenes
From: "Brian Swale" <bj@xxxxxxxxxxxxxxx>
Date: Tue, 19 Mar 2002 10:55:50 +1200
Hi Dan,

John Shaw covers this topic on pages 16 & 17 of his Complete Guide to 
Professional Field Techniques. "How to prevent  the white sunlit subject from 
washing out."  Basically, expose one stop less.

The "Sunny f/16" rule becomes the "Sunny f/22" rule.

Brian
> Date: Mon, 18 Mar 2002 10:14:27 -0700
> From: "Daniel J. Mitchell" <DanielMitchell@xxxxxxxxxxxxx>
> Subject: [OM] exposure comp. for non-grey scenes
> 
>  I was just out shooting TOPE stuff, and shot a whole lot of shots of
> basically large white mountains against large white skies. ( (West)Castle
> Mountain, southern Alberta -- pretty much your classic steeps and deeps
> hill, lots of fun, _lots_ of snow, though my legs hurt a lot today).
> 
>  I tried to work out which way to compensate for the fact that the camera
> thinks the whole world is 18 0rey, and after flipping back and forth in my
> mind, I wound up setting everything to +1. I'm not sure if this was right or
> not, so before I put this in for processing, could someone confirm if this was
> correct, or if I'm going to have to hope for sufficient film latitude?
> 
>  (reasoning there was:
> 
>  camera wants to make everything 18 0rey
>  world is actually white
>  so the camera's going to try and expose the white into a 18 0rey scene
>  so the camera's going to try and make the white too dark
>  so I want to give more light to the film
>  so I set the exp.comp dial to +, to force longer exposures.
> 
>  At the end of the day, I had a horrible feeling that somewhere along the
> line I'd got things backwards..)
> 
>  thanks,
> 
>  -- dan 


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