手控快门刻在快门调节钮环上俗称b门表示上紧快门弦后按下快门钮开始曝光松开快门钮停止曝光
The manual shutter is engraved on the shutter adjustment button ring, commonly known as the b shutter. It indicates that after tightening the shutter string and pressing the shutter button, exposure begins, and releasing the shutter button stops exposure
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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