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While the fastest lenses in general production in the 2010s were f / 1.2 or f / 1.4, the 2020s have seen several f / 0.95 lenses, see below.. What is considered "fast" has evolved to lower f-numbers over the years, due to advances in lens design, optical manufacturing, quality of glass, optical coatings, and the move toward smaller imaging formats.
After the war, the Armorlite Lens Company in California is credited with manufacturing the first CR-39 eyeglass lenses in 1947. CR-39 plastic has an index of refraction of 1.498 and an Abbe number of 58. CR-39 is now a trade-marked product of PPG Industries. [2]
Step-and-scan systems became widespread during the 1990s and essentially universal by the 2000s. Today, step-and-scan systems are so widespread that they are often simply referred to as steppers. An example of a step-and-scan system is the PAS 5500 from ASML.
US Senate salaries House of Representatives salaries. This chart shows historical information on the salaries that members of the United States Congress have been paid. [1] The Government Ethics Reform Act of 1989 provides for an automatic increase in salary each year as a cost of living adjustment that reflects the employment cost index. [2]
Debt interest has grown as a proportion of government spending in the last few years as a result of rising interest rates, and increased debt due to primarily to the cost of the Covid pandemic. [10] In financial year 2018-19, debt interest was £43 billion - around 5% of total government spending [ 11 ] compared to around 10% in 2023-24.
Tech Plus by AOL will provide around-the-clock tech support for all your devices coupled with computer and digital data protection services. • Tech Plus by AOL - Platinum - Tech Plus Platinum includes top of the line products to help protect your identity, personal data and devices, so that you have more control over your digital life.