Page 1 of 2 12 LastLast
Results 1 to 10 of 20

Thread: Need to Clean Remnants of Cellophane Off Lens

  1. #1

    Join Date
    Aug 2001
    Posts
    255

    Need to Clean Remnants of Cellophane Off Lens

    I obtained a near mint Linhof Technika Press with Zeiss objectives from an estate sale. There is one problem: The 53mm Biogon rear element was in contact with cellophane for several years and remnants of it are on the surface of the lens. It is a very thin film but lens cleaner will not remove it. Before sending it off to Focal Point Lens or similar, is there anything else I could use that is stronger but won't strip the coating?

    Also, I notice that one of the rear elements has about a 1mm air bubble in the middle of the lens! I don't how this got through inspection at Zeiss.....so I'm assuming that it must not effect image quality to any measurable degree?

    Please advise. Thanks for your help!

    JP

  2. #2
    Whatever David A. Goldfarb's Avatar
    Join Date
    Mar 2000
    Location
    Honolulu, Hawai'i
    Posts
    4,594

    Need to Clean Remnants of Cellophane Off Lens

    I'd e-mail Focal Point or Zeiss and ask what they would use, and they might tell you. My guess would be naphtha, but I wouldn't try it without getting some advice first.

  3. #3

    Need to Clean Remnants of Cellophane Off Lens

    I would try freezing the lens to see if perhaps the cellophane might curl. Of course one would needs be very careful about bringing the lens back to room temp. Perhaps put the lens in a good plastic sandwich bag before it goes into tthe freezer. Maybe start out in the fridge and slowly take the temp down before putting it in the freezer.

    This is just a guess and I don't really know squat about such things.

    What about putting a small square (1 inch) of paper towel over the cellophane and putting two or three drops of water on the paper and keep it nearly saturated for several hours (days?) Perhaps it is possible to rehydrate cellophane. Again, just guessing.

  4. #4

    Join Date
    Mar 2002
    Location
    Knoxville, Tennessee
    Posts
    1,786

    Need to Clean Remnants of Cellophane Off Lens

    I've used isopropyl alcohol (common rubbing alcohol) before with stubborn haze and good results.

    Air bubbles (air bells) are not defects and are common in older optical glasses.


    http://www.glennview.com/lens.htm


    Steve

  5. #5
    All metric sizes to 24x30 Ole Tjugen's Avatar
    Join Date
    Mar 2002
    Location
    Norway
    Posts
    3,376

    Need to Clean Remnants of Cellophane Off Lens

    At one time the air bubbles were taken as circumstantial eveidence that the lens was made from "Gutes Jenaer Glas" - Good Glass from Jena. For "Glass from Jena", read "Schott".

    The special glasses which were so important to the top-end lenses were very difficult to melt, and frequently had bubbles. Too many bubbles, and the glass was rejected. So I would think that Zeiss would have approved your lens.

    You have forgotten to mention the vintage of the lens, BTW. I believe the discard limit changed quite a lot through the years...

  6. #6
    the Docter is in Arne Croell's Avatar
    Join Date
    Dec 1997
    Location
    Huntsville, AL and Freiburg, Germany
    Posts
    1,116

    Need to Clean Remnants of Cellophane Off Lens

    If the alcohol doesn't work, a last resort might be acetone, which is a solvent for many plastics. I have used it once without problems on an Apo-Germinar from a print shop that had some transparent gluelike material on the lens. It should be ok with the coating, but you have to be careful not to touch any of the metal mounting since it will immediately dissolve any paints, lacquers and dyes in anodized aluminum. Use it sparingly on a piece of lens tissue (Kimwipes are good) and then apply it, several times. I am sure you know this, but never put it directly on the lens (that goes for all lens cleaning solutions). Note that acetone, especially the technical grade available in hardware stores, leaves a residue which can be cleaned with alcohol (after removing the other stuff).

  7. #7

    Need to Clean Remnants of Cellophane Off Lens

    Try a dropp of olive oil, leave it for a moment. Clean then with cloth and with a lens cleaner.

  8. #8

    Join Date
    Dec 2001
    Location
    San Joaquin Valley, California
    Posts
    6,728

    Need to Clean Remnants of Cellophane Off Lens

    Vodka?? If it dosen't make the cellophane go away, you can drink it!
    I steal time at 1/125th of a second, so I don't consider my photography to be Fine Art as much as it is petty larceny.

  9. #9

    Need to Clean Remnants of Cellophane Off Lens

    Hi there,

    The safest way to remove tape residue is 100% Pure Carnauba paste wax and a soft paper towel. It will not damage the glass or coating and will remove the goo from glass, chrome, leather or wood. Take your time and let the wax soften the glue. It will clean up very well and you can remove the wax with lens cleaner if you wish.

    Just a thought.

  10. #10

    Join Date
    Sep 2003
    Posts
    9

    Need to Clean Remnants of Cellophane Off Lens

    "The safest way to remove tape residue is 100% Pure Carnauba paste wax "

    Just a tiny quibble... "Pure Carnauba" is brittle & hard like hard candy. To turn it into paste it is disolved in something, like turpentine. If you don't know what that solvent is, be careful.

Similar Threads

  1. Clean up the act
    By Kirk Gittings in forum Feedback
    Replies: 6
    Last Post: 21-May-2006, 13:46
  2. How to clean a lens?
    By Mareike in forum Lenses & Lens Accessories
    Replies: 15
    Last Post: 17-Oct-2005, 17:32
  3. Need to clean optical cement off of Rodenstock lens
    By Jim Roof in forum Lenses & Lens Accessories
    Replies: 3
    Last Post: 13-Mar-2002, 14:52
  4. How to clean a lens?
    By bill_1041 in forum Lenses & Lens Accessories
    Replies: 9
    Last Post: 24-Mar-2000, 15:26
  5. how to clean a lens
    By dileep prakash in forum Lenses & Lens Accessories
    Replies: 2
    Last Post: 6-Aug-1999, 18:23

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
  •