善用 ISO 感光度,来自摄影师的6个建议

善用 ISO 感光度,来自摄影师的6个建议

合理设定 ISO 值对获得正确曝光的照片十分重要,在胶片时代,我们只能通过更换胶片来改变感光度。到了数码初期,技术已经进步到在拍摄过程中能够改变感光度,但范围仍有很大限制。在五六年前,使用上万 ISO 来拍摄根本是说笑,但随着科技进步,如今有的高级相机的感光度已经达到25600,使用高感光度拍摄不再那么“可怕”。

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下面是摄影师 Jim Hamel 分享的关于使用 ISO 的经验以及建议。

1. 如果你还在用 ISO 100 ,开始使用 ISO 200

很多朋友可能已经拍了一段时间照片,并把 ISO 尽量保持在 ISO 100,以得到最好的画质。虽然这样很安全,但如上面所说,现在的相机技术已经进步很多,使用 ISO 200 与 ISO 100 已几乎看不出分别,但它却能为拍摄争取到更多的光线,并有以下两点好处:

a.允许更快的快门速度,能够确保手持拍摄时影像的锐利度。
b.允许更小的光圈,以确保景深深度。

2. 多云或黄昏,使用 ISO 400

感光度6建议-3

不要犹豫,有需要的话将 ISO 调到 400(或更高,取决于你的相机)。如果你在有云的天气到室外拍摄,或者在日落时拍摄,调高 ISO 可以令你的拍摄更顺利,且一般不会有很明显的噪点。

3. 凝固动作用 ISO 800

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拍摄运动、水花之类,需要用上高速快门时,使用高 ISO 是最理想的,虽然有可能出现噪点,但是比起画面变模糊,还是前者比较好。虽然噪点和模糊的画面都不是理想的状态,但是噪点可以通过软件进行处理,但画面模糊却无法补救。

4. 室内使用 ISO 1600

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当拍摄地点转移到室内,如果灯光条件比较理想,那么使用ISO 1600即可。但如果光线较暗怎么办?在没有移动物体的情况下,可以使用三脚架固定相机进行拍摄,这是可以使用低感光度。但如果没有三脚架,那么为了照片的效果,就需要继续调高感光度, 1600 以上会比较理想。

5. 不要害怕使用 ISO 6400

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Jim Hamel 在拍摄女儿在表演的照片时,因为室内光线很暗,不能使用闪光灯,而且要拍摄移动中的人物,这就需要高速快门以及大光圈镜头,以避免影像模糊。此外,摄影师还将 ISO 调成 6400,虽然最终不算完美,可是如果没有将感光度设定为 ISO 6400,那整场表演的照片也会毁掉。而高感光度带来的噪点问题,可以后期在 Lightroom 中进行修正。

6. 适当地选择更高的 ISO

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虽然大家都不喜欢用太高 ISO 拍照,确实 ISO 值到 6400 或 12800 时,会出现噪点问题,但是过慢的快门与噪点相比问题大多了,所以建议大家多作尝试。

总结全文,中心大意就是“别怕高感光度”。当然,以上情况也要视不同的相机而定,大家看完这些建议,要先判断自己相机的情况,可以使用不同感光度去拍同一个场景,相信能总结出适合自己的拍摄经验。

(翻译/包杨)

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