суббота, 24 августа 2013 г.

Осторожно, радиация!

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Lenses Tested Radioactive (by the author)

  • Kodak Ektar 101mm f/4.5 (Miniature Crown Graphic camera) lens mfg. 1946
  • Kodak Ektar 38mm f/2.8 (Kodak Instamatic 814 camera) lens mfg 1968-1970
  • Kodak Ektanar 50mm f/2.8 (Kodak Signet 80 camera) lens mfg. 1958-1962 (3 examples)
  • Kodak Ektanar 90mm f/4 (Kodak Signet 80 camera) lens mfg. 1958-1962
  • Kodak Ektanar, 44mm f/2.8 (Kodak Signet 30, Kodak Signet 50, Kodak Automatic 35/Motormatic 35 cameras) lenses mfg. 1959-1969
  • Kodak Ektanon 50mm f/3.9 (Kodak Bantam RF camera) lens mfg. 1954-1957
  • Kodak Ektanon 46mm f/3.5 (Kodak Signet 40 camera) lens mfg. 1956-1959
  • Kodak Anastar 44mm f/3.5 (Kodak Pony IV camera)
  • Kodak Color Printing Ektar 96mm f/4.5 lens mfg. 1963

Lenses Reported Elsewhere As Radioactive

  • Canon FL 58mm f/1.2
  • Canon FL 50mm f/1.8
  • FL 50/1.8 I (#58233): Up to 450 cpm / 26 µSv/h at the back lens, up to 7 cpm / 0.4 µSv/h behind camera or at the lens barrel.
    FL 58/1.2 (#25516, #44528): Up to 180 cpm / 10 µSv/h at the back lens, up to 30 cpm / 1.7 µSv/h behind camera or at the lens barrel. 
  • Canon FD 17mm f/4
  • Canon FD 35mm f/2.0 (versions from the early 1970's)
  • Canon FD 55mm f/1.2 S.S.C. Aspherical (Measured at 46532 CPM @ front element )
  • Carl Zeiss Jena Pancolar 55mm f1.4 (measured at 2360 nSv/h)
  • Carl Zeiss Jena Pancolar 50mm f1.8 "Zebra"
  • Carl Zeiss Jena Biometar 80mm f2.8 "Zebra" "(Only P6 mount version )
  • Carl Zeiss Jena Flektogon 50mm f4 "Zebra" "(Only P6 mount version )
  • Focal (Kmart store brand) 35mm f/2.8
  • Fujica Fujinon 50mm f/1.4 non-EBC(Measured at 35137 CPM @ back element )
  • Fujica Fujinon 50mm f/1.4 EBC
  • GAF Anscomatic 38mm f/2.8 (GAF Anscomatic 726 camera)
  • Industar 61 L/Z MC (L is for Lanthanum - radioactive element)
  • Kodak Aero-Ektars (various models)
  • Kodak Ektanon 4-inch Projection Lens f/3.5
  • Konica Hexanon 57mm f1.2
  • Minolta Rokkor 58mm f1.2
  • Nikkor 35mm f/1.4 (early variant with thorium glass elements)
  • Olympus Zuiko Auto-S 1:1,2/55 mm (first version with thorium glass elements)
  • Olympus Zuiko Auto-S 1:1,4/50 mm (only first version "Silvernose" is Radioactive)
  • Pentax Super Takumar 35mm f/2 (Asahi Optical Co.)
  • Pentax Super Takumar 50mm f/1.4 (Asahi Optical Co.)
  • SMC Takumar 35mm f/2.0 (Asahi Optical Co.)
  • Super Takumar 35mm f/2.0 (Asahi Optical Co.)
  • SMC Takumar 50mm f/1.4 (Asahi Optical Co.)
  • Super Takumar 50mm f/1.4 (Only latest Version 2)
  • Super Takumar 55mm f/1.8 (Asahi Optical Co.)
  • SMC Takumar 55mm f/1.8 (Asahi Optical Co.)
  • Super Takumar 55mm f/2.0 (Asahi Optical Co.)
  • SMC Takumar 55mm f/2.0 (Asahi Optical Co.)
  • SMC Takumar 85mm f/1.8 (Asahi Optical Co.)
  • Super Takumar 6x7 105mm f2.4 (Asahi Optical Co.)
  • Steinheil Auto-Quinon 55mm f/1.9 KE mount 
  • Topcor RE GN 50/1.4 (Lanthanum glass) 
  • Topcor UV 50mm f/2
  • Yashinon-DS 50mm f1.4 (Yashica) (Measured at 680 nSv/h)
  • Yashinon-DS 50mm f1.7 (Yashica) (Measured at 762 nSv/h)
  • Yashinon-DX 50mm f/1.4 (Yashica) (Measured at 1359 nSv/h)
  • Yashinon-DS-M 50mm f/1.4 (Yashica) (Measured at 572 nSv/h)
  • Yashinon-DS-M 50mm f/1.7 (Yashica) (Measured at 798 nSv/h)
  • Yashinon-DS-M 55mm f/1.2 (Yashica) (Measured at 1056 nSv/h)
  • Yashinon 55mm f1.2 (Tomioka) (Measured at 981 nSv/h)
  • Leitz Wetzlar Summicron 5cm f2 (M39)
  • Vivitar Series 1 28mm f1.9 
  • Voigtlander 50mm Nokton Prominent
  • Zenitar-M 50mm f1.7 (Lanthanum glass)

Lenses with elements made of contaminated glass

Some lenses of the 1960s have elements made of glass sorts which include small traces of radioactive rare-earth elements. Sometimes this accidental radioactivity causes a significant yellowing of these lens elements. Some users of such lenses reported in camera blogs that they healed the yellowing by exposing these lenses to the ultraviolet light of the sun. The procedure needs several days of sunny weather to have a positive effect. Lens elements with such yellowing radioactive impurity are in the following lenses:
  • Minolta MC W. Rokkor-SI 1:2.5 28mm (early variant, before radioactive glass impurity could be banned)
  • Minolta MC Rokkor-PG 1:1.2 58mm (early variant, before radioactive glass impurity could be banned)
The healing of yellowing by sunlight is also reported for some lenses with thorium glass elements, for example for the Nikkor 35mm f/1.4 lens and the Super Takumar 50mm f/1.4 lens.
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