The Weston Exposure Meter FAQ
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Category: Accuracy
  1. I've heard the term "lazy cell" in a sales description for an old meter. What does it mean?
  2. What is Zero Correction for and should I be doing it!!!
  3. Hi! thanks for your excellent website! I have a trusty MasterII that I've had for about 25 years--and it's always been super dependable. My invercone for the Master IV seems to work just fine with it. I hadn't used it for some time, and when I opened the case, it wasn't reading any light! I messed around for about 10 minutes, pointing it at all sorts of sources, and...nothing. I put the meter down, and a few minutes later it seems to be working just fine. What could this mean? Thanks, David
  4. Hi there, This is a bit of info as well as a question, and it may be stupidly obvious for which I appologise in advance. I have two westons, a V and a Euro master. The V is well used and has a lazy light cell but not totally gone, the Euro is spot on. To render the V usable I set the ASA to 1000 when the Euro is set at 200 and they then give almost identical readings! The question is do the light cells fail progressively or just quit?? I use the meters with old Russian cameras so the shutters and apertures are probably hit and miss. The fun is to look at the scene and take a guess, it gets better with experience and I think that's what it is all about. Working or not the Weston V is a neat gadget regardless. Keep the faith! Vincent.



  1. I've heard the term "lazy cell" in a sales description for an old meter. What does it mean?
    As the selenuium photo-cells get older they can produce less electricity and so the meter shows a lower reading. I have really old Westons that are accurate to better than 1/2 stop but others that only just register light. Cells are affected by damp, temperature and bad luck!
    Category: Accuracy
    585 visitor(s) thought this was helpful. Do you? Yes, it was helpful No, it was not helpful


  2. What is Zero Correction for and should I be doing it!!!
    The needle should be on the zero point of the dial when there is no light whatsoever falling on the meter cell. If it is not that way, turn the zero corector screw clockwise of anti-clockwise until it is. Shouldn't need doing very often unless you have a big change in temperature.
    Category: Accuracy
    429 visitor(s) thought this was helpful. Do you? Yes, it was helpful No, it was not helpful


  3. Hi! thanks for your excellent website! I have a trusty MasterII that I've had for about 25 years--and it's always been super dependable. My invercone for the Master IV seems to work just fine with it. I hadn't used it for some time, and when I opened the case, it wasn't reading any light! I messed around for about 10 minutes, pointing it at all sorts of sources, and...nothing. I put the meter down, and a few minutes later it seems to be working just fine. What could this mean? Thanks, David
    Sounds like a bad connection inside David. Connections to the cell itself can corrode and cause this. There is nothing to be done unfortunately, you can't open the meter and even if you could, the cell connections can't really be fixed. Sometimes warming the meter will bring it back to life, but you may have to face the fact that a new meter from Ebay is the only way out.
    Category: Accuracy
    472 visitor(s) thought this was helpful. Do you? Yes, it was helpful No, it was not helpful


  4. Hi there, This is a bit of info as well as a question, and it may be stupidly obvious for which I appologise in advance. I have two westons, a V and a Euro master. The V is well used and has a lazy light cell but not totally gone, the Euro is spot on. To render the V usable I set the ASA to 1000 when the Euro is set at 200 and they then give almost identical readings! The question is do the light cells fail progressively or just quit?? I use the meters with old Russian cameras so the shutters and apertures are probably hit and miss. The fun is to look at the scene and take a guess, it gets better with experience and I think that's what it is all about. Working or not the Weston V is a neat gadget regardless. Keep the faith! Vincent.
    The cells often fail progressively or they may just quit although that is less likely. As you say, you can simply up the speed setting to compensate because it is probably still linear in it's response to light. Guessing is fine with modern fils that have lots of latitude. If it was good enough for Cartier-Bresson, it's good enough for you!!!
    Category: Accuracy
    528 visitor(s) thought this was helpful. Do you? Yes, it was helpful No, it was not helpful




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