On Feb 13, 2007, at 10:43 AM, John Whittingham wrote:

>> Probably the best and safest way to ensure
>> a good white balance is to take an extra
>> shot under the same lighting w/ a neutral
>> gray card in scene and use that for auto white balance
>> adjustment & reference image WB to adjust actual
>> image WB manually.
>
> Not the most convenient of things on a nature shoot or at the side  
> of a
> racetrack though 8)

A small card with white/gray/black patches is very easy to keep in  
your pocket and snap an exposure of if you're unsure of the light.  
The resulting white-balance setting can be used for all exposures  
taken in the same light. There are several of these available on the  
market, for anything from $10 to $50. Doesn't even have to be in  
focus... :-)

Godfrey

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