Re: [Leica] Grey card

["Dan Post" <dpost@triad.rr.com>]

Alright!
Good point- and it proves the value of the adage- "When in doubt... READ THE
INSTRUCTIONS!"
Needless to say- if the proper level of light is calculated into a meter- so
that it expects an 18% level of light, then using the Gray Card outside
might be more logical. That would mean that if one's meters are expecting an
18% reflection outside- and you DON'T use the card- then you should open up
that extra bit to allow for the difference....I would think that studio
light, and natural light would be the same.... as the current discussion has
seemed to indicate. So if the average outdoor scene does reflect the 13% of
light- then using the card would give a correct reading there, or lacking
the card- give the scene a slight increase to allow for the difference...
And that is assuming the meter is actually calibrated to 18%!  :o)
Dan (I'm getting confused- where am I? ) Post
- ----- Original Message -----
From: "Erwin Puts" <imxputs@knoware.nl>
To: "L U G" <leica-users@mejac.palo-alto.ca.us>
Sent: Wednesday, August 23, 2000 12:47 PM
Subject: [Leica] Grey card


> 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
>
>