Drone
Member
- Joined
- Dec 10, 2014
- Messages
- 3
- Format
- Multi Format
I have been looking for a good and reasonable MF kit set already for some time, and I will probably end up with Mamiya RB/RZ67 or Mamiya C330 TLR (or both). As RB 67 and C-series TLRs were designed in the 60-70's, I am wondering whether thoriated (radioactive thorium) was used in their typical lens lineup (Sekor, Sekor C, Sekor K/L, Sekor Z and Sekor TLR lenses)?
I have been browsing through many sources in the internet and it seems that some 35mm (M42?) Sekor lenses had models with thoriated (hot) glass. I haven't found though any information on RB/RZ67 or C330. One symptom of this is yellowing of the glass over time, but it seems that many of these lenses may use yellow/amber colored non-radioactive coatings anyway. Fortunately, by using geiger-counter with alpha-particle detection spotting a hot-glass should be easy (as long as just one has the glass and counter already
).
I have been browsing through many sources in the internet and it seems that some 35mm (M42?) Sekor lenses had models with thoriated (hot) glass. I haven't found though any information on RB/RZ67 or C330. One symptom of this is yellowing of the glass over time, but it seems that many of these lenses may use yellow/amber colored non-radioactive coatings anyway. Fortunately, by using geiger-counter with alpha-particle detection spotting a hot-glass should be easy (as long as just one has the glass and counter already
