Hacker News Top Stories with Summaries (January 17, 2024)
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<h1> Hacker News Top Stories</h1>
<p>Here are the top stories from Hacker News with summaries for January 17, 2024 :</p>
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Fluorite lenses: Corrective capabilities beyond ordinary optical glass
Summary: Canon's fluorite lenses offer superior corrective capabilities compared to ordinary optical glass, reducing chromatic aberration and producing high-quality images. The company developed its own technology for creating large, high-purity artificial fluorite crystals, which are used alongside glass lenses to correct chromatic aberration more effectively. Fluorite lenses are especially useful in telephoto lenses, where the long focal length exacerbates chromatic aberration.
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US developers can offer non-app store purchasing, Apple still collect commission
Summary: U.S. developers can now offer non-App Store purchasing options for digital goods, but Apple will still collect a 12-27% commission on content bought this way. Developers must apply for a StoreKit External Purchase Link Entitlement to direct users to an out-of-app purchasing mechanism. The changes stem from Apple's 2021 legal battle with Epic Games, which required Apple to change App Store rules.