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Old 24th December 2021, 08:38 AM
egrabczewski egrabczewski is offline
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Default Weston U-A-C-O markings on meters

Recently, I was intrigued what those symbols mean on the old Weston light meters, U-A-C-O, so I did some research. I'd be interested to hear from others if they have any more information.

At first I tried guessing what they mean:

U - Underexposed
A - ?
C - Contrast
O - Overexposed

but I couldn't fathom what A stood for.

In the "Weston 617 Type 2" exposure meter manual we see the start of this system:

A means "Distant Weak Contrast"
B means "Normal"
C means "Dark Strong Contrast"

U and O were not yet used but descriptions on the meter itself state:
"Darker Objects Would be Underexposed" and
"Brighter Objects Would be Overexposed".

So it looks like ABC were just chosen arbitrarily as the first letters of the alphabet without any particular meaning.

Soon afterwards, Weston replaced the B symbol with an arrow and used U-A-C-O on all their meters.

In one of their final manuals for the Weston Master 6 exposure meter, a clever author thought up a meaning for "A":

A - Absence of Contrast.

This completes the table for curious people like me who want closure!

Merry Christmas and a Happy New Year for 2022!!
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