Defogging Canonet Rangefinder

Discussion in 'Rangefinder Forum' started by Lowenburg, Jul 13, 2008.

  1. Lowenburg

    Lowenburg Member

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    I just bought a really cute Canonet in nice condition except for the rangefinder being a bit foggy. I have no reservations about disassembling it but would feel better if someone out there who has done it can post up some general directions.

    The light seals on this camera are also going to need replacement but I already found another thread that deals with that...so thanks to anyone who contributed to it.

    Finally, does anyone have battery recommendations for this camera? I'm sure the original batteries manufactured for it are no longer available, so what would be the modern equivalent?

    Thanks!
    Bill
     
  2. AshenLight

    AshenLight Member

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  3. f/stopblues

    f/stopblues Member

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    Good suggestion about going over to rangefinderforum.com. They're a good group of people with a lot of knowledge.

    I found instructions for removing the top plate there a year or so ago. It was pretty straightforward and some gentle cleaning of the inside glass surfaces made a world of difference. Good luck!
     
  4. DBP

    DBP Member

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    There is a good diagram on Rick Oleson's site http://rick_oleson.tripod.com/index-30.html.

    As for the battery, the Canonet has a voltage stabilization circuit, so a plain old silver or even alkaline battery will work.
     
  5. dmr

    dmr Member

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    Uh, ummmm ... if you've got the QL17 GIII it does not. It's a basic series circuit and very dependent on voltage. I can post a simplified schematic if anybody needs it.

    The commonly available battery will run "hot" and tend toward underexposure.

    I've been able to recalibrate the GIII to handle both the new batteries and 1600 film, but it's not something I would recommend unless you really want it.
     
  6. DBP

    DBP Member

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    Apparently I was misinformed in this thread here http://www.apug.org/forums/forum65/14386-canonet-ql17-battery-question-twist.html. But I have taken many pictures with mine over the years with a plain alkaline battery and no problem.
     
  7. dmr

    dmr Member

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    Actually, I have two cameras, the black GIII and the Mamiya SD, which have never been recalibrated. Both are well within the margin of error for color negative film with the "wrong" batteries. I just have to watch things when shooting slide film.
     
  8. dmr

    dmr Member

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    Here's a simplified schematic of the QL17 GIII.

    [​IMG]

    Most of the messy stuff has to do with the Canolite flash unit. Highlighted is the current path for the meter, which is easy to see as a series circuit. No voltage regulation at all.