WebThe Sigma Art line has redefined what photographers should expect from a third-party lens. Sigma still offers excellent value for your money. But now you’re getting premier optical … WebThe Sigma 24-105mm F4 DG OS HSM Art lens is a premium le... View full details / Choose options Quick shop SIGMA Canada 24-35mm F2 DG HSM Art / Prime performance meets the zoom versatility that’s sophisticated enough to do the job of 3 lenses. The Sigma 24-35mm F2 DG HSM Art is the worlds f... View full details ...
P67 RADIOACTIVE thorium-containing (thoriated) lenses
WebThe 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 … WebFeb 15, 2024 · Radionuclide Basics: Thorium. Thorium (chemical symbol Th) is a naturally occurring radioactive metal found at trace levels in soil, rocks, water, plants and animals. Thorium is solid under normal conditions. There are natural and man-made forms of thorium, all of which are radioactive. In general, naturally occurring thorium exists as Th … measuring length and angles quiz active
Chapter 29: Items and components containing Thorium - GOV.UK
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. … WebMar 23, 2014 · Canon introduced an FD mount Canon Thorium 35mm f2 Chrome Nose in the 70's. The glass is yellow enough that it is considered unusable for color slides. Many knowledgeable Canon B&W shooters feel this is one of the best lenses ever made as it's contrast seems to be better with it's "built in yellow filter". 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 closely resembled the first collapsible version of the Summicron. It contained slightly radioactive glass produced by Chance Brothers. measuring length interactive games