need Help for removing rear element of Rollei HFT sonnar 150/4

Discussion in 'Camera Building, Repairs & Modification' started by mk23, Jan 26, 2014.

  1. mk23

    mk23 Member

    Messages:
    11
    Joined:
    Jan 25, 2014
    Shooter:
    Medium Format
    For cleaning the fungus i need to take down the rear element. i've remove the rear bayonet, but i cant find a way to unscrew the rear element, because its seems too tight or even fixed with screws. does anyone know how to remove it. it looks like that in the figure
    thanks very much for the help:smile:
     

    Attached Files:

    Last edited by a moderator: Jan 26, 2014
  2. momus

    momus Member

    Messages:
    2,706
    Joined:
    Jun 14, 2009
    Location:
    Lower Earth
    Shooter:
    Medium Format
    It looks to me that all you have to do is remove that retainer w/ the two slots on either side. It unscrews counter clockwise and you will need a pair of dykes that will stretch that far (may have to file the tips down) and steady hands.

    It's usually possible to get to rear elements from the front as well if for some reason you can't get them out from the rear. Watch out for any spacer shim that may be in there once you get that retainer/rear element out. You'll probably have to turn the lens upside down and pop it into the palm of your hand once the retainer is removed to free the rear element.
     
  3. bdial

    bdial Subscriber

    Messages:
    5,462
    Joined:
    Jan 2, 2005
    Location:
    North East U.S.
    Shooter:
    Multi Format
  4. mk23

    mk23 Member

    Messages:
    11
    Joined:
    Jan 25, 2014
    Shooter:
    Medium Format
    thanks so much for the reply. the retainer in ring form is easy to be removed. i've done it. but the rear lens keep itself so tight in the position, that i cant even rotate it.
    so i go another way to try to remove the whole hood with lens complettly (black thin and big one).

    does anybody know how and with which proper tool?

    sorry for my poor english, i hope it was for you readable
     
  5. EdSawyer

    EdSawyer Member

    Messages:
    1,132
    Joined:
    Sep 3, 2008
    Shooter:
    Multi Format
    A friction tool (rubber stopper) would be the best thing to remove the whole rear cell. If you can get it to fit, a strap wrench would be another option, but it doesn't look like there is clearance. Sometimes a heat gun can help too.
     
  6. John Koehrer

    John Koehrer Subscriber

    Messages:
    6,470
    Joined:
    Apr 3, 2004
    Location:
    Montgomery,
    Shooter:
    Multi Format
    rubber stoppers can be had from ye olde hardware emporium. Get one slightly larger than the diameter of the tube. You will need to apply some pressure to get a solid grip.
     
  7. mk23

    mk23 Member

    Messages:
    11
    Joined:
    Jan 25, 2014
    Shooter:
    Medium Format
    Thanks eveyone i will try with rubber stopper and report it