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Why are some objectives marked UV?

April 26, 2017marked UV

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Why are some objectives marked UV?

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Ordinary glass is relatively opaque to ultraviolet light wave lengths below 400 nanometers. UV objectives contain specially formulated glass elements and coatings to transmit a relatively high percentage of light of such wave lengths. These objectives are very useful for near ultraviolet excitation in reflected light fluorescence work. The new Olympus infinity-corrected U-planapochromats and U-planfluorites have such improved transmission in the near ultraviolet.