Site Sponsors
Results 1 to 6 of 6

Thread: Dust in Lenses

  1. #1
    Subscriber Member
    Join Date
    Dec 2007
    Posts
    58
    Post Thanks / Like

    Dust in Lenses

    I have noticed that dust in Large Format Lenses appears to be something to be expected. You might not notice any dust under the bright sunlight but when you use something like a high intensity quartz you will most likely see it.

    While I know the dust I have found does not seem to affect my negatives I am wonder if any of you take your cells apart and clean the glass on the inside of the cells?

    Jason

  2. #2
    Senior Member
    Join Date
    May 2009
    Posts
    447
    Post Thanks / Like

    Re: Dust in Lenses

    Do you really mean take apart the cells, as opposed to just unscrewing the cells from the shutter to get at the other external surfaces?

    If so, do you have an optical bench setup, along with experience in precision assembly and in the procedures used to verify that optical elements are properly aligned?
    Last edited by Oren Grad; 14th September 2010 at 07:18.

  3. #3
    Sr. Administrator Jack's Avatar
    Join Date
    Oct 2007
    Location
    Los Altos, CA
    Posts
    10,486
    Post Thanks / Like
    Images
    1031

    Re: Dust in Lenses

    What Oren said. Easy to unscrew each cell group and clean the inside elements outer surface -- and usually that's where most of the dust is... Just be careful to not loose any small brass spacers that may (or may not) reside on the thread flange for the element group, usually front only.
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

  4. #4
    Subscriber Member
    Join Date
    Dec 2007
    Posts
    58
    Post Thanks / Like

    Re: Dust in Lenses

    I have no problem removing the cells and cleaning both sides of them. What I was talking about was removing the retaining ring from the rear or front of the cell, taking out one element so you can clean the dust off the inside of the glass. I do not know about having to have an optical bench set up. Yes some of the lens designs are more complex, but some designs are less complicated such as the Tessar. I have a repairman that does CLA on shutters that I have gone to and he was able to remove a retaining ring and pop out the lens so I could clean both sides of it. That is what I was suggesting.
    Jason

  5. #5
    Sr. Administrator Jack's Avatar
    Join Date
    Oct 2007
    Location
    Los Altos, CA
    Posts
    10,486
    Post Thanks / Like
    Images
    1031

    Re: Dust in Lenses

    I wouldn't, but that's me... If it was so dusty in there I couldn't stand it, I'd pay for a professional CLA by somebody who knew how to get it back together properly aligned.
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

  6. #6
    Member
    Join Date
    Jan 2009
    Location
    Montreal, Quebec, Canada
    Posts
    54
    Post Thanks / Like
    Images
    1

    Re: Dust in Lenses

    I wouldn't take apart the front or rear lenses group. I would leave them to the service dept. Since you might more pieces then expected.

    Yes I do clean all sides to each lenses group, paying attention to the spacer position.

    I totally agree with Jack.

Tags for this Thread

Posting Permissions

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