Posted: Fri Aug 16, 2013 8:53 am Post subject: |
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scsambrook wrote:
This looks like what used to be called "balsam separation" back in the days when everybody used canada balsam to glue the lens elements together. Then, it was possible to cure the problem by re-heating the affected element to allow the balsam to melt and so "heal itself". Today's lens cements may be different, but if you want to sell the lens and maximise the price it might be worthwhile trying root out a repairer who does such work and asking his/her advice. I know there are at least two sources in the UK for tackling this and there must be similarly competent firms in the USA.
I recall being told back in the 1960s by the optical repairers we used that this occured particularly in lens with steeply curved surfaces. _________________ Stephen
Equipment: Pentax DSLR for casual shooting, Lumix G1 and Fuji XE-1 for playing with old lenses, and Leica M8 because I still like the optical rangefinder system. |