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远摄镜头

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远摄镜头
折射式远摄镜头的光学示意图
L1 - 正长焦镜片组
L2 - 负长焦镜片组
D - 光阑(diaphragm)

远摄镜头,或称为长焦距镜头长焦镜头望远镜头,俗称大炮,一般是焦距50mm以上的镜头[1],视角狭窄,景深短,价格通常随焦距增加而作几何级上升。一般用于拍摄远距离主体,如生态摄影及运动摄影。由于镜身较重及景深短 ,比较容易因手震而出现失焦,而快门要求亦较高。

智能手机上,部分中高端手机也配备有长焦镜头,宣传上一般称为“X倍光学变焦”。如主摄镜头为等效23mm,长焦镜头为等效70mm,在宣传上可能被称为“3倍光学变焦”。这类借由切换多个镜头达成变焦功能与利用单个变焦镜头所达成的光学变焦有所不同。

远摄镜头也分有其他子类型,像是中远射镜头:视野在30°和10°之间(转换135焦距为67mm至206mm之间);以及超远摄镜头:镜头视野8°到小于1 °的视野(转换135焦距超过300mm)。

拍照效果

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当相机与被摄物的距离与光圈值保持不变时,镜头焦距越大时,视角越小,画面容纳的物体越少,背景与前景的大小越相近,同时影深越短。

参见

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参考文献

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  1. ^ Telephoto Lens - 望遠鏡頭. terms.naer.edu.tw. [2019-03-26]. (原始内容存档于2019-08-12). 
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远摄镜头
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