I obtained an older 250mm f6.7 Fujinon that has separation on the front and back elements and covers the whole lens. I can remove the elements from the barrel and have heard that if there is a visible crack oil can be applied to fill the separated elements. Can any member please advise of the type of oil I should use and should the whole of the glass be immersed in the oil or do I just apply to the crack with a brush. Any advice gratefully received.
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