Pardon the typo.
Your wife may never notice the typo. She'll likely smile and say, "yes, dear" no matter what you tell her.
She does that with her glazed stare when I go more into the technical side of things.
EV - Exposure Value is a function of shutter speed and aperture only.
LV - Light Value is a measure of the light only.
At ISO 100 these numbers coincide. e.g. for ISO 100, an LV reading of 15 means you should use an EV setting of 15.
At ISO 200, half as much light is needed so an LV reading of 15 will require an EV setting of 16.
I put this in my photography field journal. Thanks for the great info.
Lots more information than you will ever need id here: http://www.fredparker.com/ultexp1.htm
EDIT: I see someone has already linked to this.
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I will be attaching the charts from fred parker into my fieldbook too. Their printed out, just needs to be attached.