Front lens cleaning marks...

Discussion in 'Camera Building, Repairs & Modification' started by cmo, Aug 25, 2011.

  1. cmo

    cmo Member

    Messages:
    1,457
    Joined:
    Aug 22, 2006
    Shooter:
    35mm RF
    On my desk there is lens that is critically ill, a non-AI Nikkor 1.4/50mm. This is not an expensive lens these days, but I fell pity with it. :sad:

    It suffers from cleaning marks, and it's somewhat blotchy. It does not look so bad, but there is a problem, and it does affect contrast on the images.

    I know this can't be fixed, but are there any dirty tricks to make it work better? What is the best way to clean the front lens if a first try with a lenspen fails to remove the 'blotchyness'?
     
  2. ic-racer

    ic-racer Member

    Messages:
    7,470
    Joined:
    Feb 25, 2007
    Location:
    Midwest USA
    Shooter:
    Multi Format
    Get a junk lens with frozen focus or damaged aperture blades and swap the front and rear elements. In my opinion that is the best fix. Re-coating is never a financially sound option and more cleaning can just make it worse.

    [​IMG]
     
  3. paul ron

    paul ron Member

    Messages:
    1,864
    Joined:
    Jan 22, 2004
    Location:
    NYC
    Shooter:
    Medium Format
    Check KEH "AS IS" bin to see if you can find an inoperative lens for $5 n use the front element?

    There is a little trick we use on scratched lenses.. blackening. If the scratches are deep enough just wipe some blackening over the lens surface n wipe it clean leaving the blackening in the scratches, they won't defract as much as an open scratch will n not show in your pics either.

    I've never tried it on cleaning marks but worth a try since you have noting to lose.
     
  4. cmo

    cmo Member

    Messages:
    1,457
    Joined:
    Aug 22, 2006
    Shooter:
    35mm RF
    Paul, what kind of blackening do you use?
     
  5. paul ron

    paul ron Member

    Messages:
    1,864
    Joined:
    Jan 22, 2004
    Location:
    NYC
    Shooter:
    Medium Format
    It's a flat black enamel paint.