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pv17vv
Joined: 22 Dec 2001
Posts: 255
Location: The Ardennes, Belgium
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 Posted: Fri Apr 18, 2008 4:37 pm Post subject: Time and Weston lightmeters |
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| How does time usually affect the sensivity of antique Weston lightmeters ? Low/high/erratic ? |
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brian d
Joined: 15 Jan 2008
Posts: 44
Location: indiana
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| Posted: Fri Apr 18, 2008 5:34 pm Post subject: |
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I have 3 of them 2 are very accurate 1 reads way low.
whenever I get a "new" old meter I compare it to a trusted newer meter
under various conditions to determin if it can be used or not.
Brian |
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Les
Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI
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| Posted: Fri Apr 18, 2008 8:39 pm Post subject: |
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The simple straight forward answer is YES. In theory they ALL should degrade by a certain percentage, but theory and reality are... ahem, relative.
Les
_________________
"In order to invent, you need a good imagination and a lot of junk" Thomas Edison |
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Dan Fromm
Joined: 14 May 2001
Posts: 2159
Location: New Jersey
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| Posted: Fri Apr 18, 2008 10:58 pm Post subject: |
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Some years ago I got a Master V. It worked but clearly had linearity problems. I sent it to Quality Light Metric in, IIRC, North Hollywood. George told me that the galvanometer needed a new spring and that there were other mechanical problems. The cell was fine.
I've never ever got a used light meter that was accurate across its range. Each of the three I sent for service (the Master V, a Lunasix II and a Lunasix III) came back working properly. |
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