Results 1 to 6 of 6

Thread: Is it possible to fix the de-cementing in a lens?

  1. #1

    Join Date
    Sep 2011
    Location
    Waterloo, Ontario, Canada
    Posts
    135

    Is it possible to fix the de-cementing in a lens?

    I have acquired an Optar 162 mm f/4.5 lens in which the rear doublet has suffered very obvious de-cementing. Is there anything that can be done to fix this defect?

    Click image for larger version. 

Name:	IMG_6981-c-rear-640x640-80.JPG 
Views:	18 
Size:	98.3 KB 
ID:	125949

    Click image for larger version. 

Name:	IMG_6982-c-front-640x640-80.JPG 
Views:	23 
Size:	78.0 KB 
ID:	125951

  2. #2

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    5,972

    Re: Is it possible to fix the de-cementing in a lens?

    Yes!

    There are threads in the DIY section. Use "Balsam" as a search word.

  3. #3

    Join Date
    Sep 2011
    Location
    Waterloo, Ontario, Canada
    Posts
    135

    Re: Is it possible to fix the de-cementing in a lens?

    Yes, I understand that Canada balsam is the cement used in holding the elements of the doublet together, but where can I buy the balsam? Who sells it? In what quantities? How do I perform the restoration? I have not dared to try such repair work before, so I am hesitant to ruin a lens that might work just fine as it is, even in ugly condition.

  4. #4

    Join Date
    Jan 2009
    Location
    Denmark
    Posts
    5,972

    Re: Is it possible to fix the de-cementing in a lens?

    As I mentioned before, there are answers to all these questions and much more in the DIY threads!

    I would guess that the Optar has synthetic cement - but the repair can be done with balsam.

  5. #5

    Join Date
    Dec 2000
    Location
    Tonopah, Nevada, USA
    Posts
    6,338

    Re: Is it possible to fix the de-cementing in a lens?

    A 162 Optar is a great lens to learn on because if you do spoil it, they're quite replaceable and cheap. You'll have to find a way to cut into the brass that is 'rolled' around the back of the lens in order to free the glass from the barrel. A friend with a lathe is one way. Put the lathe in 'neutral' and rotate the chuck by hand as the cutter advances. Then read all the good stuff that's been written before and give it a go. Nothing to lose. I think those lenses were produced by Rodenstock which was famous for having delamination problems with that first generation non-balsam cement.

  6. #6

    Join Date
    Sep 2011
    Location
    Waterloo, Ontario, Canada
    Posts
    135

    Re: Is it possible to fix the de-cementing in a lens?

    Can't be Rodenstock. It must have been made by Wollensak. It's a Raptar rebadged using the Graflex Optar name.

Similar Threads

  1. Lend Re-Cementing--A New Source
    By Keith Fleming in forum Lenses & Lens Accessories
    Replies: 5
    Last Post: 8-Oct-2010, 06:29
  2. Re-Cementing a Lens: Anyone want to help?
    By Frank R in forum Lenses & Lens Accessories
    Replies: 3
    Last Post: 25-Jan-2010, 12:15
  3. Help! Lens de-cementing experiences
    By Nick Morris in forum Lenses & Lens Accessories
    Replies: 7
    Last Post: 29-Jun-2004, 19:00

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •