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Thread: Gossen Luna Pro F

  1. #1
    Unwitting Thread Killer Ari's Avatar
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    Gossen Luna Pro F

    Hi,
    My recently acquired Luna Pro F is exhibiting signs of underexposure.
    Compared to my benchmark, the Minolta IVf, it is consistently under by 1 2/3 stops.
    I have reset the needle, changed the battery, turned the calibrating screw at the back; all to no avail.
    Anyone have any tips, something I missed, or useful information?
    Thanks

  2. #2

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    Re: Gossen Luna Pro F

    Do you have the exposure compensation tab set to zero? If there's a red spot showing on the edge of the dial, it should be covered up by the black tab.

    Cheers, Steve

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    Re: Gossen Luna Pro F

    Steve,
    The EC tab is indeed set to zero; I have to set it to -1 2/3 in order for it to line up with the Minolta reading.
    I've read elsewhere that these meters are frequently off by at least one stop, so I guess I'm asking how do I re-calibrate it?
    Thanks

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    Re: Gossen Luna Pro F

    If it is consistent why worry?

    --Darin

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    Re: Gossen Luna Pro F

    My Profisix (the immediate predecessor, a.k.a. Lunapro SBC for the metrically challenged) never has been off - if there should be a systematic error that must be particular to the Lunasix F.

    If the calibration screw at the back is past its range, you'll either have to live with it, or mail it in to Gossen Germany - they still service all black shell generation Lunasix/Profisix models.

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    Re: Gossen Luna Pro F

    Sevo,
    What do you mean by "past its range"?
    Thanks

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    Re: Gossen Luna Pro F

    I think all the adjusting screw does is zero the needle. There is no "range".

  8. #8
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    Re: Gossen Luna Pro F

    From what I can see on my meter, the adjusting screw moves the needle back and forth about a half stop, even if you keep turning it in the same direction.
    If this isn't the norm, somebody please let me know, as that may be the problem.
    Thanks

  9. #9

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    Re: Gossen Luna Pro F

    I thought the adjusting screw was just to zero the meter (with no meter reading taken) not to bias the result one way or the other....might not have much "range" to it...

    --Darin

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    Re: Gossen Luna Pro F

    Quote Originally Posted by Darin Boville View Post
    I thought the adjusting screw was just to zero the meter (with no meter reading taken) not to bias the result one way or the other....might not have much "range" to it...

    --Darin
    That's correct; I suppose that the needle on mine is functioning properly.
    Now, what to do about the almost 2-stop discrepancy?

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