Archived posting to the Leica Users Group, 1999/04/10

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Subject: Re: [Leica] metering middle grey
From: Walter S Delesandri <walt@jove.acs.unt.edu>
Date: Sat, 10 Apr 1999 16:36:48 -0500 (CDT)

I don't think anyone insults B.S. ONLY because of his technical 
writings!! :_ :) :) :) 
Walt
On Sat, 10
Apr 1999, delia wrote:

> Actually Bob Shell is right!.  You should open +1/2 when taking a reading from a grey card outdoors.
> Not to burst any bubbles, but some of you graduates from  _IT need to check Kodak's technical publications before insulting him.  The matter isn't new actually -- Ctein published a few articles on the subject in the now defunct Camera & Darkroom.
> Meters are calibrated to read approx. 13.5% - the average outdoor scene.  Grey cards are 18% - in the studio, and under even lighting, they will give correct readings without any compensation.
> Light readings are a pretty complicated subject.
> The 18% problem is perpetuated, because over the years most camera manufacturers, photo schools, publications, repair shops, and even our dear LUG members insist wrongly that meters are calibrated for 18% grey. 
> As always, the important thing is to do what works for you.  Hell, I just take a reading from my hand and open +1 stop -- and then check the highlights, if I have time. 
> This is yet another factor to take into account, as well as variations in readings from two identical meters, the linearityof the meter readings, light angle of incidence, readings of different colors, light transmission problems, results from different labs, etc.
> Hope this is of help.
> 
> Regards,
> Robert
>