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减焦距镜
安装在摄影镜头光路中,可使该摄影镜头的焦距值成倍率(如0.42×、0.7×)缩小的附属镜。为倍率镜的一种。又称减倍镜、广角附加镜。
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John Joseph Mearsheimer
John Kani
John Keats
John Kemp Starley
John Kenneth Galbraith
John King Fairbank
John Knox
John Knudsen Northrop
John Lackland
John Lander Harper
John Langshaw Austin
John Leask Lumley
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John Lewis Gaddis
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John Lilburne Case
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John Logie Baird
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John Loudon McAdam
John Louis Hope
John Louis O'Sullivan
John Lucian Savage
John Lwanda
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