半幅 Half-frame camera
（重定向自Half frame）
半幅（Half-frame）指的是一类成像时候仅使用标准的底片格式一半尺寸大小的规格。
半幅概念即为全幅的一半，也被称作半格，相应的半幅相机也被称作半格机。最常见的半幅指的是135胶片的一半大小，约为 18x24mm 。
Half frame
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英语百科
Half-frame camera 半幅
（重定向自Half frame）
A half-frame camera is a camera using a film format at half the intended exposure format. A common variety is the 18×24 mm format on regular 135 film. It is the normal exposure format on 35mm movie cameras. For still cameras using the 35mm film, the usual format is 24×36 mm, so still cameras taking 18×24 mm exposures are called half-frame cameras.
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