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11-13-2009, 02:19 PM   #1
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Helios 44-2 old version lens - radioactive?

hi there, i am curious, can anyone confirm if the helios 44-2 old version lens is radioactive with thorium in/on the glass? if not can anyone get their geiger counter out and test theirs? many thanks!

11-14-2009, 03:29 AM   #2
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I have a helios 44-2. It does not show the signs of thoriated glass (no yellowing) and I cannot detect any radioactivity using my geigercounter. During background research into the use of thorium oxide in optical glass I have never come across any mention of this material being used in any of the Helios lenses.
11-14-2009, 10:32 AM   #3
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I somehow doubt they used exotic glass in a helios. The optical design is very old.
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