Good info... so boiling water should work. Maybe the detractors just didn’t boil long enough or, as Dan suggests, was boiling a lens with something other than Canada Balsam.
I also recall reading something on the internet where it was suggested to heat the element, concave side up, in a 300 degree oven for a while and the balsam might smooth out and any bubbles flow to the edges and escape. Wouldn’t that be nice???
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