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Thread: Can't remove lens from board, any tips?

  1. #1

    Join Date
    Feb 2007
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    53

    Can't remove lens from board, any tips?

    I have an old ektar 127 on a speed graphic board and I need to remove it to try to clean the Synchro Compur shutter. The slow speeds are terrible.

    But the retaining ring is a bit recessed and I am having trouble getting a wrench in to remove it. I have broken a bit already, and I think the thing needs some encouragement to loosen up. Would something like liquid wrench or blast away(?) lubricant help or destroy the components? I thought of heating it up with an heat gun, but don't want to melt anything!

    thanks

  2. #2

    Join Date
    Nov 2007
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    Nuremberg Germany
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    Re: Can't remove lens from board, any tips?

    Quote Originally Posted by gdi View Post
    I have an old ektar 127 on a speed graphic board and I need to remove it to try to clean the Synchro Compur shutter. The slow speeds are terrible.
    Why do you think you can clean a Synchro Compur if you cannot remove the shutter from the lensboard? You will need not only the tools but also the skills. Or can you fix grandfather's pocket watch too?

    A leaf shutter isn't so different from a watch.

    Peter

  3. #3

    Join Date
    Apr 2009
    Location
    Seattle area, WA
    Posts
    923

    Re: Can't remove lens from board, any tips?

    I don't think you even need to take it off the lensboard. Try following the instructions for CLAing a Synchro-Compur on this page. It's way down near the bottom- lots of good stuff there.

  4. #4

    Join Date
    Feb 2007
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    53

    Re: Can't remove lens from board, any tips?

    Quote Originally Posted by Peter K View Post
    Why do you think you can clean a Synchro Compur if you cannot remove the shutter from the lensboard? You will need not only the tools but also the skills. Or can you fix grandfather's pocket watch too?

    A leaf shutter isn't so different from a watch.

    Peter
    Actually I have built many precision pocket watches using only tin snips and old beer cans. If you behave yourself I might be convinced to sell you one.

  5. #5

    Join Date
    Jun 2007
    Location
    Portland, OR.
    Posts
    159

    Re: Can't remove lens from board, any tips?

    I'm in a similar situation. I want to sell a camera, but not the 127mm Ektar in Supermatic #2 shutter, so I need to remove it from the lensboard.

    Problem is, It won't budge. The retaining ring is not slotted for a spanner, and is screwed to the lensboard, but turning the shutter against the lensboard proves futile. Is there a retaining pin somewhere that I'm missing?
    My darkroom used to be a meat freezer.

  6. #6

    Join Date
    Feb 2007
    Posts
    53

    Re: Can't remove lens from board, any tips?

    Quote Originally Posted by domaz View Post
    I don't think you even need to take it off the lensboard. Try following the instructions for CLAing a Synchro-Compur on this page. It's way down near the bottom- lots of good stuff there.
    Thanks Domaz, The problem is that I need to remove the rear element and it looks like it will be much easier with the lens detached. But I will take another look at it.

  7. #7

    Join Date
    Dec 1997
    Location
    Baraboo, Wisconsin
    Posts
    7,695

    Re: Can't remove lens from board, any tips?

    If your retaining ring has the usual slots buy the S.K. Grimes spanner wrench from - surprise - S.K. Grimes. The ends are adjustable so that they can fit down into the recessed area. I used mine with several different kinds of recessed boards and they worked like a charm. They're slightly pricey (about $30) as spanner wrenches go but they're the usual Grimes quality and once you have it you'll never need another one. I'll be selling mine one of these days, if you're interested send me an email message.
    Brian Ellis
    Before you criticize someone, walk a mile in their shoes. That way when you do criticize them you'll be
    a mile away and you'll have their shoes.

  8. #8

    Join Date
    Feb 2007
    Posts
    53

    Re: Can't remove lens from board, any tips?

    Quote Originally Posted by Brian Ellis View Post
    If your retaining ring has the usual slots buy the S.K. Grimes spanner wrench from - surprise - S.K. Grimes. The ends are adjustable so that they can fit down into the recessed area. I used mine with several different kinds of recessed boards and they worked like a charm. They're slightly pricey (about $30) as spanner wrenches go but they're the usual Grimes quality and once you have it you'll never need another one. I'll be selling mine one of these days, if you're interested send me an email message.
    Thanks Brian, I'll send you an email. I have several wrenches but nn seemed to fit well enough to be able to apply adequate pressure.

  9. #9

    Join Date
    Aug 2000
    Location
    California
    Posts
    3,335

    Re: Can't remove lens from board, any tips?

    Two nails only partially through a board at the appropriate separation provide a good emergency retaining ring wrench. Although I have two good wrenches, I sometimes have to resort to this solution.

  10. #10

    Join Date
    Jul 2010
    Location
    UK
    Posts
    26

    Re: Can't remove lens from board, any tips?

    The secret to removing the ring is to get a decent grip with a good quality spanner wrench of the correct size and shape. The thing you really want to avoid is attacking it with something that doesn't fit and damaging the slots. You may then end up with a ring almost impossible to remove...

    You can buy spanner wrenches on ebargumbay and from tool stockists. Even good quality ones sometimes need to be 'fine tuned' on a grindstone to get the tips to be a good fit if the slots are small. When you have a spanner that is a good fit - apply a SMALL amount of thread release/ penetrating oil. Make sure it just goes on the threads... put a little on a needle and let capillary action pull it in to where it is needed, rather than squirt it everywhere

    Place the whole lot in a well sealed plastic bag and place in the fridge for a few hours.

    When it comes out, touch a soldering iron ( a precision electronic one - not a 25LB brass pot handle tool!) to the ring - being very careful to touch only the ring - for just a short while. Then try it. Gentle shock treatment sometimes works (very gentle taps with your knuckles - not a sledge hammer!

    HTH

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