Posted: Fri Nov 15, 2019 10:46 pm Post subject: |
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kymarto wrote:
Even if it were produced with thoriated glass, which most probably it was not, being slower than 1.4, it would make not a whit of difference unless you used it as an eyepiece for six hours a day for a decade. I have a bunch of radioactive lenses, and using them is harmless. _________________ Vintage lens aficionado |