Thorium lenses

Author: okmo

August undefined, 2024

WebOriginal – "Some older photographic lenses were produced with glass elements containing small amounts of thorium. If stored in the dark for prolonged periods of time, these … WebThere 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 …

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WebJan 27, 2024 · Radioactive lenses. Many lenses produced from the 1940s through the 1980s are measurably radioactive. The main source of radioactivity is the use of thorium oxide … WebJul 28, 2024 · When the thorium begins to decay, it discolours crystalline gaps at an atomic level (Farbe centers), and once transparent glass turns brown (sends auto white balance into a hissy fit, and produces a rather sickly tint if you don’t swap to’K’. Off-topic, but the Thorium in this lens is often reported on the internet as relatively harmless. devin booker steph curry

Combined X-ray absorption and SEM–EDX spectroscopic analysis …

WebApr 26, 2014 · Thorium dioxide was formerly added to glasses during manufacture to increase their refractive index, producing thoriated glass with up to 40% ThO 2 content. These glasses were used in the construction of high-quality photographic lenses . WebFeb 2, 2005 · The reason camera companies stopped using Thorium in lenses has nothing to do with radioactivity. Any Thorium based lens turns yellow over a timespan of 20-30 … 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 glass including lanthanum oxide. Thoriated glass can contain up to 30% by weight of thorium. The thoriated glass elements in lenses over ti… churchill college cambridge library

Thoriated Camera Lens (ca. 1970s) - Museum of …

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WebOct 11, 2012 · YouTube user uyt384 does tests on old camera lenses, but not in the way you'd expect. ... (S-M-C Takumar), well known for its radioactive thorium glass element near the rear of the lens. WebAug 5, 2024 · Radioactive Vintage Lenses. In the 1940s, scientists and lens designers at Kodak, a world-famous camera and filmmaker, started experimenting with mixing rare earth elements into their lenses. After a series of tests, they found out that by adding Thorium 232 to lenses they can improve the quality of images produced. devin booker still with kendall jennerWebJul 26, 2015 · Hi. I recently bought one of the radioactive Takumars (50mm f/1.4 Super) and it's clearly yellow due to the thorium content. Well, I removed the caps and covered the lens in aluminium foil (obviously not the front lens area) like some people have advised not to warm the lens too much in sunlight. churchill college cambridge events

"WebFeb 15, 2024 · Thorium is a naturally occurring radioactive metal found at trace levels in soil, rocks, plants and animals. Thorium is used very little in industry, but can be found in heat … " - Thorium lenses

Thorium lenses

Radioactive Lenses and Everything About Them - Lens …

WebOct 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 bending of light to produce more compact lenses of a given focal length and aperture. Kodak, Yashica, Mamiya, (and of course, Asahi), among others used thorium glass. WebOct 7, 2024 · Older camera lenses: some camera lenses from the 1950s-1970s incorporated thorium into the glass, allowing for a high refractive index while maintaining a low …

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WebEverything in the 24mm to 50mm should be within your price range. The 50 f/1.4 is a good starting point if you want an excellent portrait lens. The 35mm f/2.8 is also great if you want something in the more normal range. I would only recommend you stick to the nFD variants since they don't use radioactive thorium in their construction. WebThe results are comically extreme: Once he's done messing with us, Stern dives into the numbers to explain why radioactive lenses are actually nothing to worry about. A …

WebMar 20, 2024 · Thorium is an element that can be found in small amounts in rocks and soils. It was first discovered in 1928 by Swedish chemist Jöns Jacob Berzelius, who named it after Thor, the Norse God of Thunder.Thorium dioxide is added to silica mixtures to create glass with high refraction and low wavelength dispersion, which is ideal for lenses used in … WebThe Void Lens is an item used to summon Coznix, The Fallen Beholder in The Underworld. Failing to summon the boss does not consume the item. The sprite for this item was the winner of the Thorium Mod Discord's Spriting Contest for Week 8, made by 8953draculA. 1.6.1.0: Sprite updated.

WebAug 1, 2024 · If you use vintage lenses, you might have heard that some of them are radioactive. As a matter of fact, many lenses produced between the 1940s and the 1970s emit a measurable amount of radioactivity. It comes from the element named Thorium, which was used in the glass elements of the lenses. But should this […] WebJul 19, 2024 · The Mamiya-Sekor on the other hand is entirely metal, is a fast f/1.4 lens, and yet still weighs in at a mere 305g. It also looks almost diminutive in comparison. As a manual focus lens, the focusing ring is very smooth with a fairly wide throw, and the aperture ring is pleasant with palpable and audible clicks at each half-stop.

WebOct 8, 2024 · Of course, any lens could benefit from the addition of thorium, and after the war ended it started finding its way in to consumer products – primarily into lenses for high-end cameras. Over the years a number of manufacturers began making thoriated lenses, a practice that continued into the 1980s. churchill college cambridge chapelWebFind many great new & used options and get the best deals for Canon Fd 2/35mm Chrome Nose Thorium Glass #23406 Concave (1680983164) at the best online prices at eBay! Free shipping for many products! churchill college fellowsWebApr 11, 2024 · Thorium (Th) is a naturally ... These analyses were performed using the available experimental setup at the INE-Beamline using polycapillary half-lenses to achieve an X-ray beam footprint of about ... churchill college cambridge outreachWebOct 1, 2024 · 💀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... devin booker street clothesWebJun 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. … devin booker the valley jerseyWebThe reason for having thorium is to improve the quality of light passing through the lens by allowing it to pass through the glass more quickly. The yellow tint inhibits the ability for … churchill college cateringWebEven the same lens, with the same name, produced in different factories, may have different data on resolution and other characteristics. Some Soviet lenses have received their update and are still produced on the territory of modern Russia. So, for example, the legendary Helios-40 received bayonet options and minor updates. devin booker teammates