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攝影ABC:怎樣拍閃電

拍攝閃電前,一定要通過觀察,摸清閃電的活動規律,以便作好準備工作.
拍攝時要注意以下幾點:
1. 閃電的光亮並不一樣,有時很亮,有時又不夠亮,而且是間隙性的.曝光時,要根據它的不同亮度控制曝光.
在有風的天氣裡,閃電是流動的,所以要摸清它的流動方向.根據事先觀察到的閃電在天空中的位置,確定相機的拍攝位置與角度.相機要固定在三腳架上.
2.  拍閃電可使用一次曝光法.因閃電時間很短,按地面景物亮度進行長時間曝光時,即可把閃電拍攝在內.拍閃電也可使用兩次曝光法.先拍攝地面景物,然後當閃電時,再進行第二次曝光.如果認為一次閃電不夠時,還可多次曝光.多次拍閃電時,要注意避免閃電重疊.也可以在拍攝時使用兩張膠片,分別拍攝地面景物與閃電,然後把兩張底片相疊放大.
3. 為了防止閃電時相機顫動,應使用結實的三腳架,用快門線**縱.使用單鏡頭反光相機時,應把反光鏡鎖上,以減少振動.
4. 野外拍攝時,要注意不要把相機淋雨受潮,以免導電而發生危險.

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