Is my Gossen Luna-Pro working?

Discussion in 'Exposure Discussion' started by Digidurst, Apr 12, 2005.

  1. Digidurst

    Digidurst Subscriber

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    Hi ya'll! I have recently acquired a Gossen Luna-Pro light meter and I'm not sure if it's working properly or not. When I change the ISO I don't get much if any change in my readings. Doesn't that seem odd? I've tested the batteries and they seem fine. Any ideas on what's going on?

    Thank you as always for your input :smile:
     
  2. Jorge

    Jorge Inactive

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    It sounds like it is not working, have you tried taking a measurement against a working meter?...

    oh..btw, I see Il douche bag could not resist another stupid comment. Looks like your thread is on the way to becoming another pile of shit....sorry Digi....
     
  3. BradS

    BradS Subscriber

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    I guess it depends on what you mean by "don't get much if any change in my readings"

    Maybe this is obvious but, if you change the film speed setting from ISO100 to ISO200 for example, the meter reading should only change by one stop...so, if the meter says f/8, 1/125 second at ISO100, then it'll say f/11, 1/125 second at ISO200....

    Is this consistent with what you see? If it is, then, your meeter is fine.
     
  4. Ole

    Ole Moderator Staff Member Moderator

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    Also, the only thing that is going to change is the f-stop/speed combination. The needle won't move, and the measured EV is the same.
     
  5. Digidurst

    Digidurst Subscriber

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    Huh? Who? Did I miss something?
     
  6. Digidurst

    Digidurst Subscriber

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    Acutally, I did miss something... my brain!! My God, I shock myself with how unbelievably brain-dead I can be sometimes! LOL

    The meter does work... the needle doesn't move... Well duh! Thank you, Ole, for pointing out the obvious to me.

    Jeez, I swear I need either more sleep or more coffee. <see Digi whack herself upside the forehead>
     
  7. rjr

    rjr Member

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    DD,

    no, you missed nothing - the "Ornello" troll replied and his account seems to be suspended, his reply deleted.
     
  8. mark

    mark Member

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    Glad you figured it out. I LOVE my Luna Pro.
     
  9. William Parrish

    William Parrish Member

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    One other thing. If your LunaPro was manufactured prior to late 70's--early 80's, then it was made to use mercury batteries. It won't work right with the alkaline replacement batteries even though the battery number is the same. The alkaline batteries do not have the stable voltage that mercury provides, and the alkaline are 1.5 volts, compared to the 1.35 of mercury. Bogen makes an adapter that comes with batteries for somewhere if the range of 25 to 30 bucks. It seems that a lot of folks on ebay aren't aware of the conversion adapter, and sell off their LunaPros when they put in new batteries and the needle starts to bounce around.

    Bill
     
  10. Lee Shively

    Lee Shively Member

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    The converter works great too. I wasn't able to use my Luna Pro for several years until I discovered the Wein air cells and, finally, the battery converter.
     
  11. David Brown

    David Brown Subscriber

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    Is that for the old px625 battery? If so, would this same adapter work for old Minolta SRTs, et al?

    Cheers

    David
     
  12. William Parrish

    William Parrish Member

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    David,
    The Gossen took two of the px625's and the adapter, likewise holds two sr44 batteries. My SRT201 only takes one px625, so I'm thinking we're out of luck on this one. Although, the walls of the adapter are only plastic, and you may be able to trim it to the physical height of one px625. I'm pretty sure the voltage would be the same whether one cell or two. Just might work. If you try it, let me know.

    Bill
     
  13. William Parrish

    William Parrish Member

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    My error. The batteries are in series, which would result in the voltages being summed.

    Bill