Flying with thorium lenses

Author: qadm

August undefined, 2024

WebThoriated glass elements allowed lenses to deliver low levels of aberration and distortion with relatively simple and easy to manufacture designs. As with everything in engineering, there are trade-offs. Thorium is a … WebOct 4, 2024 · Paris-based photographer, filmmaker and weird lens enthusiast Mathieu Stern shows us using a Super Takumar 35mm f/2! First, he tells us that these radioactive …

Thorium - From Lenses to Fuels - Nevada Technical Associates, Inc.

WebTaylor et al. (1983) measured the absorbed dose rate at the back of a camera and the thorium content of the lens. The thorium in the lens was estimated to be 13 kBq (0.36 … 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 … raymond plushie

A Radioactive Lens - Fourmilab

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. WebOct 8, 2024 · At the same time, the properties of thorium help to reduce the dispersion of different wavelengths of light (the different colors) as they pass through the glass. The … WebThis laser system incorporates a II-VI Infrared optical component. This optical component contains a small amount of thorium fluoride, a type of source material (less than 10% by … raymond p mcandrews

Thorium coated camera lens, what kind of danger is there from ... - reddit

Flying with Bifocals - Backcountry Pilot

WebFeb 23, 2024 · Some lenses produced from the 1940s through the 1970s were treated with radioactive thorium oxide to curb chromatic aberration.But as Andrew Walker explains in … WebJun 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. … raymond playhouse theatreWebOct 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 … raymond p mongillo community center

"WebMar 1, 2014 · Thu Feb 27, 2014 10:42 pm. Re: Flying with Bifocals. Hi JDW, the problem with no line bifocals is that the actual usable lens area is hour glass shaped and off the the sides of the lens your view will get fuzzy. You can set aside your vanity and get lined bifocals or you can "get used" to the lenses without lines (You will get used to it). " - Flying with thorium lenses

Flying with thorium lenses

WebFeb 2, 2024 · Flying on an aeroplane (about 2μSv/h of Cosmic radiation) ... Current consumer lenses do not contain thorium – it has been replaced with newer formulations … 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 years. So all those great Thorium wides from the 50s and 60s turned into useless, off-color paperweights in the 80s and 90s, when color became the dominant lifeform in photography.

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http://camera-wiki.org/wiki/Radioactive_lenses WebAug 1, 2024 · He placed near the lens some Usnea Barbata, a plant sensitive to radioactivity. And for the second test, he kept the lens near him for a week, all the time. On day seven…. Oh god, no, is that blood? Okay, time to get serious. A radioactive lens containing Thorium emits around 0.01 mrem/hr. For comparison, a chest X-ray emits 10 …

WebAug 22, 2024 · Ghery Pettit. I've been using progressive lenses for over 25 years. No problem at all with flying, other than when wearing foggles for instrument flying. Darned foggles wipe out the part of the lens that focuses on the radio stack, so I can't see the count-down timer on the 430W. Other than that, no problem at all. 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 …

WebCross Country Flight: ~5 mrem (~1 mrem/hr flying) Average yearly background dose: ~350 mrem ( ~1 mrem a day) Putting it into perspective, occasionally using these lenses really …

WebNov 11, 2016 · It discusses the early MC Rokker lenses (1966-1972) where it says: "The quality of the coatings on these lenses is as a general rule not as good as those on later MC and MD lenses, and in some cases radioactive compounds of thorium and lanthanum were added to the glass mixture to increase the refractive index. This is apparent in some of …

WebBased on the dates of the previously mentioned patents, I suspect that the first commercial lenses to incorporate thorium appeared in the 1950s. These lenses have been … raymond plush animal crossingWebDec 9, 2010 · Canon did have "Flourite" lenses - these had a green band around the hood (if there was a built in hood) - and were marked flourite on th ename ring. Flourite lenses ar enot common - there was a 24mm which I've never seen, a 55/1.2 which they made around 350 off, plus the 300/2.8 flourite. These are all old FD mount. raymond pngWebApr 4, 2024 · There is no risk associated with flying if you have floaters or flashes. The only time it may not be safe to fly is if you have had retina surgery and have a gas or air … simplify 1421There 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 … See more Typical radiation levels can approach 10 mR/hr (100 μSv/h) as measured at the lens element's surface, decreasing substantially with … See more raymond p mooreThoriated 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… simplify 14/15WebOnce a pilot has fully recovered with a fixed lens and meets FAA vision standards, they typically may return to flying on their current medical. Note, however, that in Sep 2014 … simplify 13 to the second powerWebFlight armor is a craftable Thrower armor set crafted from Feathers. It takes a total of 20 Feathers to craft a full suit. It consists of a Flight Hat, Flight Mail and Flight Boots. The … simplify 14/18