How to remove lenses from lens board?

Discussion in 'Enlarging' started by menglert, Sep 29, 2006.

  1. menglert

    menglert Member

    Messages:
    197
    Joined:
    Feb 14, 2006
    Shooter:
    35mm
    I recently moved my Omega D5 (I think) enlarger into my darkroom with the expectation of moving up to 4x5 soon. As I was cleaning off the lenses and turret I gently tried to remove the lens from the turret mounting board, but was unsuccessful.

    Is it possible to remove lenses off the mounting boards or are they essentially a permanent fixture once attached?

    In the past I tried removing one of the lenses, but broke the aperture ring in the process.

    Regards,
    Martin
     
  2. ann

    ann Subscriber

    Messages:
    2,920
    Joined:
    Sep 10, 2002
    Shooter:
    35mm
    they should come off, you may need a filter wrench to use on the jam nut.
     
  3. reellis67

    reellis67 Subscriber

    Messages:
    1,887
    Joined:
    Mar 10, 2005
    Location:
    Central Flor
    Shooter:
    4x5 Format
    As Ann stated above, it is best to remove the lens by way of removing the retaining ring rather than twisting the lens itself. I once had an enlarger with a fixed lens stage where the lenses screwed directly into it, but generaly speaking, lenses mount on a board or some type by way of a retaining ring.

    - Randy
     
  4. Markok765

    Markok765 Member

    Messages:
    2,266
    Joined:
    Apr 26, 2006
    Location:
    Ontario, Can
    Shooter:
    Medium Format
    My MF enlarger lens board has a screwmount and a retaining ring
     
  5. menglert

    menglert Member

    Messages:
    197
    Joined:
    Feb 14, 2006
    Shooter:
    35mm
    I have the lenses another look, but still have no idea what a jam nut or filter wrench is...:confused: Sorry, but at least I'm attempting to learn:D

    Anyone care to explain more?

    Thanks,
    Martin
     
  6. Nick Zentena

    Nick Zentena Member

    Messages:
    4,679
    Joined:
    Nov 21, 2004
    Location:
    Italia
    Shooter:
    Multi Format
    The nut will be on the back of the lensboard. So this assumes the lensboard comes off. I've no idea what happens with the turret. All of my enlargers are setup with threaded lensboards. That lets me just unscrew the lens without using a jam nut.
     
  7. Ole

    Ole Moderator Staff Member Moderator

    Messages:
    9,281
    Joined:
    Sep 9, 2002
    Location:
    Bergen, Norw
    Shooter:
    Large Format
    In theory it should just unscrew (I've got some threaded lens boards).

    In practice, there are some b*st*rd "previous ovners" who have superglued the lens to the lens board. If that's what has happened, try removing all the lens elements and baking the rest in a medium hot (180°C) oven for half an hour.
     
  8. menglert

    menglert Member

    Messages:
    197
    Joined:
    Feb 14, 2006
    Shooter:
    35mm
    I spy no nut :confused:

    I took a close look but found nothing that screw into the lens board to hold the lens. The only nut/screw I found was on the lens for the aperture ring.

    -Martin
     
  9. menglert

    menglert Member

    Messages:
    197
    Joined:
    Feb 14, 2006
    Shooter:
    35mm
    Well I got the 80mm off the board. I see how it was fitted with a nut now, and was able to loosen it and unscrew it. Although the 150mm seems to be attached in a different way. I'm not too concerned about getting the 150mm off at the moment, and think its best I leave it alone as long as it works well.

    Thanks for the help.

    -Martin
     
  10. ann

    ann Subscriber

    Messages:
    2,920
    Joined:
    Sep 10, 2002
    Shooter:
    35mm
    a jam nut is a thin black ring that the lens screws into, if the lens board is not threaded
     
  11. Ronald Moravec

    Ronald Moravec Member

    Messages:
    1,237
    Joined:
    Jan 17, 2005
    Location:
    Downers Grov
    Use a spanner wrench in the notches of the retaing ring/jam nut.

    If no retaining ring, it is a a screw in.

    When indoing, be careful as there could be corrosion causing sticking and undo force is required.

    Most if not all the oval mounting plates required a retaing ring. I think I have one screw in for a 50mm.