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Author Message   Glenn Tinkerer Username: Glenn Post Number: 887 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, January 10, 2011 - 02:40 am:    This looks like degradation of the Balsam used to cement a couple of the individual glass components of a lens element together. Correcting this is a major job, well beyond the means of most DIY folk and many professional repairers also - one has to separated the glued components and then re-glue after aligning the optical axis of all the components. The separation as it is will only cause problems at large apertures. Using a brick wall as a test target take a photo at every aperture value - examination of the negs will soon reveal which aperture values are useable.