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[舊聞] 藍寶石水晶filter
http://petapixel.com/2015/03/17/novo-to-be-the-first-lens-filters-to-feature-sapphire-crystal-glass-for-strength-and-clarity/
The Sapphire UV filter is the one that uses sapphire crystal glass for “incomparable strength and clarity.” Sapphire has a value of 9 on the Mohs scale of mineral hardness, so it’s significantly stronger and more scratch-resistant than standard glass filters. It’s also resistant to water and oil.
The glass also has great optical transmission qualities, allowing for 99.9% of light through while blocking 99.95% of UV wavelengths. Dimensions-wise, the Sapphire UV filter has what Novo claims is the world’s slimmest frame, measuring just 2.38mm in width.
The Sapphire UV filter is the one that uses sapphire crystal glass for “incomparable strength and clarity.” Sapphire has a value of 9 on the Mohs scale of mineral hardness, so it’s significantly stronger and more scratch-resistant than standard glass filters. It’s also resistant to water and oil.
The glass also has great optical transmission qualities, allowing for 99.9% of light through while blocking 99.95% of UV wavelengths. Dimensions-wise, the Sapphire UV filter has what Novo claims is the world’s slimmest frame, measuring just 2.38mm in width.
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