Thorium glass lens

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August undefined, 2024

WebSep 5, 2024 · Lead, Lanthanum and Thorium glass production were halted as of 2001. For example, the 38mm (Zeiss) Biogon in the (Hasselblad) SWC underwent a slight …

Radioactive lenses - Camera-wiki.org - The free camera …

Web💀100% WRONG. Facts about Thorium lenses. Its neither a coating NOR merely ALPHA emitter FACT: The only naturally occurring isotope of thorium is 232Th and i... About 10 years ago Roger … foo fighters hero youtube

Atom-Nikkor (Nikkor-N 35mm f/1.4 Thorium) ~1970

WebDec 26, 2015 · If thorium or radium is used in the eyepiece glass, this could be another story because they have shorter half-lives and the radiation level is higher. I don't think intermittent eyepiece use even with the latter elements in the glass would cause any harm, but I wouldn't carry them around in my pocket all day. Frank WebFlickr photos, groups, and tags related to the "thorium lens" Flickr tag. WebFeb 2, 2005 · Any Thorium based lens turns. yellow over a timespan of 20-30 years. So all those great Thorium. wides from the 50s and 60s turned into useless, off-color. … electric trek bikes

CANON LENS FL 50mm 1: 1.8. Review from the reader Radozhiva

Did the Jupiter 12 ever have a thorium-containing element?

WebThe gamma and beta emissions from high thorium content lenses in photographic cameras have the potential to degrade the film if the latter was left in the camera for a substantial … WebDec 17, 2024 · I think it may quickly became a one lens option for travel: - fast (1.4). - small (52 mm filter). - all metal & glass - real gem. - good in visible, even at night. - usable in UV. - will check infrared and full spectrum tomorrow. BTW: there is a focus shift in UV - when I focus at infinity in UV, I see 5m at the lens distance scale. electric tree trimmers toolsWebOct 12, 2024 · Thorium dioxide has a 30-50% higher refractive index than typical glasses which translates into some combination of less-curved (thinner) elements or greater … electric tree trimmer tool

"WebAug 29, 2024 · This is a common misconception. The thorium is in the glass itself. As a rule of thumb, if a lens has a strong yellow or yellow-green color cast, it probably has one or more thorium elements. They can be de-yellowed by long exposure to light like an IKEA LED lamp (you can google it). No reason to reject those lenses. " - Thorium glass lens

Thorium glass lens

Introduction of Thorium Oxide into Super Takumar Lenses

WebMar 17, 2024 · The Aero Ektar was hard coated and the thorium glass resulted in a high quality lens. However, eventually thorium glass became an embarrassment for the optical industry. Some firms like Zeiss West, Minolta and Leica tried to avoid thorium as did the Russians. However, some Leica camera lenses have contained thorium glass. Kodak … WebJan 14, 2024 · Many photographers love using vintage lenses for their unique character. With Thorium-coated “radioactive lenses,” their yellowish tint is what gives them a distinct look. However, the downside is that the color intensifies with time, turning the lens’ “character” into something that’s more of a nuisance. If you own a Thorium-coated …

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WebJul 18, 2024 · Thoriated glass is a glass material used in the manufacture of optical systems, specifically photographic lenses.It is useful to this process due to its high refractive index.Thoriated glass is radioactive due to the inclusion of thorium dioxide, oxide of radioactive element thorium.It has therefore been succeeded as a material of choice by … WebSep 14, 2024 · Lead, Lanthanum and Thorium glass production were halted as of 2001. For example, the 38mm (Zeiss) Biogon in the (Hasselblad) SWC underwent a slight formulation change due to the new glass restrictions. Most of the heavy metal glasses were phased out in the late 70s and 80s due to environmental and workplace hazards. So, there’s one reason.

WebJan 27, 2024 · Many lenses produced from the 1940s through the 1980s are measurably radioactive. The main source of radioactivity is the use of thorium oxide (up to 30% by … WebDec 13, 2011 · The f/2 lens and f/1.8 lens had the same formula and glass. [Generally, the f/2 lenses had a waterhouse stop to keep from using them at f/1.8 ! However, I recently obtained a Super Takumar 55mm/2 of the earliest type ("2" at the left of the numbers on aperture ring) that has an unmarked clicked stop that is really f/1.8.]

WebCanon Fd 2/35mm Chrome Nose Thorium Glass #23406 Concave (1679777724) Cameras & Photo, Lenses & Filters, Lenses eBay! WebThe gamma exposure rate associated with something containing thorium (e.g., welding rods, thoriated lenses, parts made from magnesium-thorium alloys) changes over time. How the exposure rate changes depends on how many years it was after the purification of the thorium that the item was produced.

WebMany lenses produced from the 1940s through the 1980s are measurably radioactive. The 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. Thorium oxide has a crystalline structural similar to calcium fluoride ().Like fluorite, its optical properties of high refractivity and low …

WebMar 31, 2024 · All three lens share the same optical design but each version of the lens got different lens coatings and updated glass used in the lens. The two older versions of the Pentax 105mm f/2.4 used thorium glass … electric trek verve+ 3 highstepWebJun 7, 2024 · A Radioactive Lens. Between the 1940s and 1970s, a number of camera manufacturers designed lenses employing thoriated glass in one or more elements. … foo fighters hey johnny parkWebFeb 8, 2024 · The thorium in the lens irradiates the images with life. A subtle yellowing of the elements acts as a warm filter. Some people decide to ‘de-yellow’ the thorium glass, but I prefer to keep it. There is plenty of clear modern glass on the market and only a few warmly glowing thoriated lenses from the bygone era. foo fighters hits 1996WebGeneral. Edit. There are a significant number of lenses produced from the 1940s through the 1970s that are measurably radioactive. 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. Thorium oxide has a crystalline structural similar to calcium fluoride (fluorite). electric trek mountain bikeWebMay 3, 2013 · A Pentax camera with a radioactive Super Takumar 50mm f/1.4 lens attached. Kodak in particular was quite prolific in using thorium glass elements. Their name shows … electric trek bikes for saleWebThis quantifies the cost elements associated with each segment of manufacturing and differentiates between electricity and natural gas processes for flat glass, container glass, … foo fighters hey johnny park lyricsWebLow-dispersion glass (LD glass) is a type of glass with a reduction in chromatic aberration (less rainbow effect). Crown glass is an example of a relatively inexpensive low-dispersion glass.. Special low dispersion glass (SLD glass) and extraordinary low-dispersion glass (ELD glass) are glasses with yet lower dispersion (and yet higher price). ). Other glasses in … foo fighters hits album