这是因为，第一片和卢米埃尔兄弟，已经建立了一个胶卷两分半钟的长度和使用的摄影机。
This is as with the first films and cameras used by the Lumière brothers, which had a length of film rolls of two and a half minutes .
胶卷或感光片应在日食前装入暗盒。
The films and plates are put in their holders the night before the eclipse.
当胶卷拍完时，胶片会自动倒片，这时曝光计数器显示“E”。
When the film reaches the end, the film rewinds to completion automatically and the exposure counter displays" E".
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