4 Lenses with elements made of radioisotope-containing glassPentax Super-Takumar 55mm f/2 Standard Lens for M42 Mount Excellent++ from JP. With this follows also the SMC Takumar/SMC Pentax 120mm f2.8, which is just an upscaled version of the 105mm f2.8 5 by 4 elements design. I havent been able to find any information about the 105mm lenses, neither the Takumar/Auto Takumar 4 by 4 elements version, nor the Super Takumar/SMC Takumar/SMC Pentax 5 by 4 elements version.
Auto Takumar 55Mm F2 Professional Filmmakers And
5.1 Lenses Tested Radioactive (by the creator of this page)It is a very rare Sonnar type Takumar F2 m42 mount. This feature will be appreciated by professional filmmakers and. Thanks to the 10-bladed aperture, this lens has a beautiful bokeh, the subjects located outside the depth of field are shown with highly circular features. The optical scheme comprises 6 elements in 5 groups. Trending price is Auto-Takumar 55mm f/2.2 is a manual focus prime lens for SLR cameras.
5.2 Lenses Tested Radioactive (elsewhere, or by contributors to this page)I did try a Takumar 75mm lens and didnt really rate it too highly compared to the 45mm and 55mm lenses. The picture of these lenses has become much sharper than it was at f1.4. Leaders: Minolta MC Rokkor-PG 50mm f/1.4, Minolta MD Rokkor 50 mm f/1.4 and Olympus OM-System Zuiko Auto-S 50 mm f/1.4.
Radioactivity in lanthanum containing lenses is due to the intentional inclusion of thorium in the optical glass mix. Despite statements to the contrary, lenses containing lanthanum are not appreciably radioactive - lanthanum is only 1/10,000th as radioactive as thorium. Like fluorite, its optical properties of high refractivity and low dispersion allows lens designers to minimize chromatic aberration and use lenses of lower curvature, which are less expensive to produce. Thorium oxide has a crystalline structural similar to calcium fluoride ( fluorite). Main source of radioactivity is the use of thorium oxide (up to 30% by weight) as a component of the glass used in the lens elements. 5.3 Lenses Tested non-Radioactive (by contributors to this page)There are a significant number of lenses produced from the 1940s through the 1970s that are measurably radioactive.
In addition, many professional level Ektar lenses from this era contain thorium. 800 and 814, but not 100 or 124) cameras. From the 1940s through the 1960s, substantial numbers of amateur cameras were produced and sold with thoriated (containing thorium oxide) lenses, including some of the Pony, Signet, and high end Instamatic (e.g. Normally these particles are stopped by skin, but the surface of the eye can be quickly damaged by them, and at close range, the dose can be very high.By far the most prolific known producer of radioactive lenses was Eastman Kodak. They can give a very large alpha and beta particle dose to the cornea of the eye, potentially causing cataracts and other problems. However, thoriated glass eyepieces are significantly more dangerous.
Kodak Ektar 38mm f/2.8 ( Kodak Instamatic 814 camera) lens mfg 1968-1970 Kodak Ektar 101mm f/4.5 (Miniature Crown Graphic camera) lens mfg. Several users have also reported that exposure to UV light from artificial sources, including fluorescent bulbs and UV-emitting LEDs is an even more effective method for reducing the appearance of browning.Tested lenses Lenses Tested Radioactive (by the creator of this page) The procedure requires several days of sunny weather to have a positive effect.The effective diminishment of radiation-induced browning by exposure to sunlight has also been reported for some lenses with thorium glass elements, for example for the Nikkor 35mm f/1.4 lens and the Asahi Super Takumar 50mm f/1.4 lens. Some users of such lenses reported in camera blogs that they reduced the browning by exposing these lenses to the ultraviolet rays of the sun. Sometimes this incidental radioactivity causes a significant browning of these lens elements.
Kodak Color Printing Ektar 96mm f/4.5 lens mfg. Kodak Anastar 44mm f/3.5 ( Kodak Pony IV camera) Kodak Ektanon 46mm f/3.5 ( Kodak Signet 40 camera) lens mfg. Kodak Ektanon 50mm f/3.9 ( Kodak Bantam RF camera) lens mfg. Kodak Ektanar, 44mm f/2.8 ( Kodak Signet 30, Kodak Signet 50, Kodak Automatic 35/Motormatic 35 cameras) lenses mfg. Kodak Ektanar 90mm f/4 (Kodak Signet 80 camera) lens mfg.
(early version with graphic hyperfocal distance scale) Canon 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. Canon FL 50/1.4 (#15324) Up to 770 cpm at the rear lens. Bell & Howell Director Series (Model 1208?) XL Super 8 movie camera Zoom Lens f: 1.2 \ F: 9-22.5 mm Agfa Solinar 50mm f/2.8 (Agfa Karat 36, front element group, serial S01812): 385CPM/2.4 uSv/h (front), ~100CPM/0.7 uSv/h (rear) Agfa Color Solinar 2.8/50 (serial S51644): ~70cpm at the front
Carl Zeiss Jena Pancolar 55mm f1.4 ( measured at 2360 nSv/h) Canon (SUPER-CANOMATIC LENS) R 50mm 1:1.8 No.78xxx YouTube Aspherical (Measured at 46532 CPM front element S.S.C non-Aspherical is not radioactive) YouTube Canon FD 55mm f/1.2 S.S.C. Canon FD 35mm f/2.0 (versions from the early 1970's - concave front element)
Carl Zeiss Jena Flektogon 50mm f4 "Pre-Zebra" (Only P6 mount version) Measured 23.6 uSv/h Carl Zeiss Jena Flektogon 50mm f4 "Zebra" "(Only P6 mount version ) YouTube Measured 2.5-3.0 µSV/h Carl Zeiss Jena Biometar 80mm f2.8 "Zebra" "(Only P6 mount version ) Carl Zeiss Planar 80mm f/2.8 (Rolleiflex 2.8D, taking lens: rear element measured at 0.12-0.18 uSv/h, serial 1242942)
Fujica Fujinon 35mm f/1.9 EBC ( Arkku at mflenses.com) Fujica Fujinon 19mm f/3.5 EBC ( Arkku at mflenses.com) Enna München Lithagon 1:3.5 35mm (M42) ( DCC.de) Carl Zeiss Tessar 80mm f/2.8 (old silver Hasselblad version )
Heinz Kilfitt 40mm f/2.8 Makro-Kilar (all variants) GAF Anscomatic 38mm f/2.8 (GAF Anscomatic 726 camera) Fujica Fujinon 600mm f/5.6 EBC ( Arkku at mflenses.com) Fujica Fujinon 400mm f/4.5 EBC ( Arkku at mflenses.com) Fujica Fujinon 100mm f/2.8 EBC ( Arkku at mflenses.com)( Youtube) Fujica Fujinon 50mm f/1.4 EBC early style = non-uniformly segmented focusing ring YouTube (unspecified EBC or not)
Konica Hexanon AR 50mm f1.4 (smallest aperture 16 green AE marking) Kodak Instamatic M24/26 Super 8 Camera YouTube Kodak Ektar 135mm f/3.5 (for Hasselblad 1600F and 1000F, made 1949) Kodak Ektar 80mm f/2.8 (for Hasselblad 1600F and 1000F, made 1948-1950) Kodak Ektanon 4-inch Projection Lens f/3.5 Kodak Aero-Ektars (various models) YouTube
Rokkor-SI 1:2.5 28mm (early variants) Mamiya/Sekor 58mm f/1.7 (M42 version) - 1.19 µSV/h ( ) Mamiya/Sekor 55mm f/1.4 (m42, chrome+black, flat rear element) (Measured by specialists, 25th april 2014 Poissy, France: from 5 to 10 µSV/h by direct touch & 1720 CPM). Leica 50mm f/2 Collapsible Summicron YouTube
Mitakon (Zhongyi) 50mm f0.95 Ver I Speedmaster （4 Lanthanum optic elements) Minolta MC Rokkor 1:1.7 85mm (the earliest variant of the MC line)
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