Gossen Lunasix

Discussion in '35mm Cameras' started by DD, Nov 10, 2005.

  1. DD

    DD Guest

    I received one of these as a gift from the seller of my Leica M6 last
    night. Unfortunately there was a battery inside that has probably not
    seen the light of day since the item was purchased back in 1959! I
    managed to get the battery cover off and there is some corrosion, but
    not as bad as I thought. I have seen much worse. Hopefully I can find a
    replacement cell, but if not, it's not a train smash.

    It came in a case complete with German manual, but as my German is
    schiese, can anyone explain how it operates? There are two buttons on
    the right, one dark grey, one light grey. If I press the dark grey one
    it seems to open the cover to the measuring cell, so I imagine that is
    the one used to activate a reading. What's the lighter one for?

    Also, what is the sliding button on the rear of the meter near the
    battery compartment for?
    DD, Nov 10, 2005
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  2. DD

    Norm Dresner Guest

    Okay, I have a Luna Pro, but some things are the same as on the Six.

    The sliding switch on the bottom near the battery compartment is the
    "battery check" switch. There should be a red mark on the dial -- probably
    about 2/3 of the way up. If the needle doesn't make this mark when you
    slide the switch, you need to change batteries ;-))

    I don't know what batteries the Six uses, but I'll describe the Pro's.
    They're button-cells (not coins). O/A diameter is 15mm, O/A thickness is
    6mm. There's a 13mm diameter protrusion on the top that's 2mm high and a
    similar one on the bottom that's only 1mm. If your batteries match this,
    then they're PX 625 or PX13.

    Can't help you with the side buttons.

    Norm Dresner, Nov 10, 2005
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  3. DD

    DD Guest

    Thanks anyway, Norm. Yes, the cell I need is a 625 and fortunately they
    are still available here. I will be picking one up on my way home this

    I'm just hoping the spill from the previous cell hasn't damaged the
    circuitry beyond reasonable repair. It looks like a nice meter
    DD, Nov 10, 2005
  4. El Thu, 10 Nov 2005 10:15:51 +0200, DD escribió:
    Your is the original model. The dark button is for low light levels, and
    activates the scale on the top (from 1 to 12), and the light one
    activates the scale on the bottom (from 11 to 21). The meter was
    originally intended for mercury cells, not available now. You can use SR44
    cells, but the meter should be recalibrated (you can do it yourself, if
    you are handy and have a precise light meter or a camera with it) , or an
    adapter must be used to lower the voltage from 1.55 volts to 1.35 volts.
    There are some information about that in internet. Google for "mercury
    cell replacement". I think also the manual in english can be downloaded
    from some place. Hope this helps.
    Javier González, Nov 10, 2005
  5. DD

    Hans Brouns Guest

    Hans Brouns, Nov 10, 2005
  6. DD

    no_name Guest

    Google "Gossen Lunasix manual" produces several links to the manual in
    English. The one listed here appears to be the one you describe.

    no_name, Nov 10, 2005
  7. DD

    Norm Fleming Guest

    Do you mean that 625 mercury batteries are still available in S.A. ?

    Or are you talking about 625 alkaline batteries??



    I will be picking one up on my way home this
    Norm Fleming, Nov 10, 2005
  8. DD

    DD Guest

    Hell, I didn't bother to check. I think it would be alkaline. Anyway,
    the damn thing doesn't work even with the new battery. The meter must
    have suffered some kind of internal damage. Now if I could figure out a
    way of opening it up to check I would be happy, but there are no visible
    screws on it other than the calibration screw in the back. IS that a
    calibration screw?
    DD, Nov 11, 2005
  9. DD

    DD Guest

    DD, Nov 11, 2005
  10. Not exactly: it is used to match the needle to zero with no battery. You
    have to peel off the thin metalic plate in the rear to gain access to four
    screws to open it. It is a tricky part. Unscrew the four srees, and once
    you have opened it, mind not to loose a small ball and a tiny spring (used
    to the click stop) in the incident-reflected switch. The meter has five
    adjustable resistors inside, used to calibrate it. Two of them are used to
    adjust the lower and the upper part of the low scale, other two for the
    high scale, and the other one for the battery check.If you need more
    details I will be happy to try to help you, if my poor English is enough
    to it!.
    I bought a meter like yours for near to nothing, and after
    calibrating it and several minor repairs, it works perfectly. It is
    extremely accurate and very sensitive, not bad for a 40 years old meter!.
    Javier González, Nov 11, 2005
  11. DD

    DD Guest

    Javier, thanks so much for the information. There's nothing wrong with
    your English, by the way. It's better than some of the English I have
    seen written by some people who only know English!

    I will probably open it up tonight and see what's going on in there.
    Will let you know if I need any more advice.

    BTW, this meter was bought brand new in Johannesburg in 1959 for the sum
    of £9! I have the original receipt! Very nice looking meter, I must say.
    DD, Nov 11, 2005
  12. Keep in mind you probably have the Lunasix "first version" and Javier
    may be giving detailed info on the much more common Lunasix III. Maybe
    the adjustments are identical, but maybe not... Move cautiously!
    Chris Loffredo, Nov 12, 2005
  13. Sorry, I do have the "first version", with the two separated buttons, not
    the slightly newer with the two buttons combined in one, or the later
    lunasix 3. Regards
    Javier González, Nov 14, 2005
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