WebDec 1, 2005 · Probably NO lens of the late 50s had thorium glass, and probably very few had thorium before. In the 'Annals of optics and precision engineering' (Jahrbuch für Optik und Feinmechanik) it was mentioned in the early 60s (don't remember the date) that thorium was soon replaced by lanthanium. WebFlickr photos, groups, and tags related to the "thorium lens" Flickr tag.

Konica Hexanon AR 57mm f1.2 Lens Review - Lens Legend

WebGlass containing thorium oxide has both a high refractive index and wavelength dispersion, and is used in high quality lenses for cameras and scientific instruments. Thorium oxide (ThO 2 ) is relatively inert and does not oxidise further, unlike UO 2 . WebMar 2, 2016 · Posted February 29, 2016. A lens called the Summitar* was produced in two batches with serial numbers from 812242 to 812323 and from 812341 to 812360. This … istc safety training

Occupational Doses from the use of Thoriated Optical Components

WebMar 9, 2024 · In the 1940s to 1970s, some lens manufacturers used such chemicals in the production of lens optical glass in order to obtain better optical display effects, such asThorium dioxideandLanthanides. Thorium dioxide is used to make high-temperature ceramics, atomic energy fuels, incandescent lamps, electron tube cathodes, electrodes … WebAug 5, 2024 · These lenses often are pretty spicy in terms of radioactivity which can sound scary first but in reality, they are 100% safe to use unless you grind the thoriated glass into a powder and inhale it or eat it. Thorium and its decay products emit alpha beta and gamma radiation. Alpha and beta particles are easily stopped by the glass itself as ... WebConstructed with eight elements in six groups and with radioactive thorium oxide glass, the Canon 55 mm F/1.2 lens renders excellent quality images. With a 55 mm focal length and 0.6 m closest focusing distance, this Canon lens lets you capture the minutest details. if you nasty dont me