Archived posting to the Leica Users Group, 2000/08/24

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Subject: Re: [Leica] Grey card
From: "Simon Lamb" <simon@sclamb.com>
Date: Thu, 24 Aug 2000 09:29:26 +0100
References: <000201c00d3b$5b010940$bb2340c3@pbncomputer>
 
Whuy does someone not just "invent" a grey card with 13% reflectance?

Simon


Erwin Puts wrote:

> The grey card reflects 18% and indeed, most natural scenes reflect 13%,
> which should be common knowledge as the relevant study dates from 15 years
> ago. I noted this a long time ago, when I discussed the relative merits of
a
> grey card. If you read the instruction leaflet of the Kodak greycard they
> will tell you that the grey card is designed and optimised for studio
> lighting and contrast and there the 18% reflection is experimentally the
> best compromise. Kodak incidentally notes that when using the grey card
> outdoors to increase exposure by a half stop to compensate for the 13%!!!
>
> Erwin
>
>
Replies: Reply from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] Grey card)
 In reply to: Message from "Erwin Puts" <imxputs@knoware.nl> ([Leica] Grey card)