相机感光度是越高越好还是越低越好?
为什么?我们眼睛感光度范围是多少?
推荐回答(5个)
在照照片的时候,只要不会发生抖动模糊,使用感光度越低越好。
因为感光度越高,杂讯越多,噪点越多画面变差。
而相机的感光度,分为可用感光度和理论感光度。
可用越高越好,比如尼康全幅单反可以达到3200或者6400的可用感光,使用那样高的感光度画面仍然和小dc的iso200差不多。这种感光度可能让你在以往无法拍摄的情况下拍出精彩照片。
理论上的参数没有太大意义,小dc的3200感光度惨不忍睹,大多只能可用到400.
人眼的感光度为iso800,但是最牛逼的是人眼的分辨率和动态范围,我想动态范围是相机永远达不到的。
相机感光度(又称ISO)高和低是根据环境而定的,没有好与不好的说法。
在光线比较暗的情况下把ISO调高的话会降低快门速度也就是说可以让照出的照片不是很模糊但是有得必有失,高的ISO使照片颗粒感很强的,低的ISO会是画面细腻。分别是ISO100、200、400……12800等等。普通情况下一般是用ISO100。
一般来说,小DC的极限是400.再高相片就没法要了。噪点反差色彩一塌糊涂。
小DC上的高感光度纯属商业噱头,没有什么实际意义。这是小DC的小感光芯片先天决定的。
越低越好,原因看看这个http://hi.baidu.com/swimmer168/blog/item/dfdc6402f845f77f3812bb7b.html
人眼的感光度看看这个http://article.pchome.net/content-103756.html
ISO感光度与画质之间有着密切的联系。提高ISO感光度时产生噪点的原因之一是在对影像信号进行增幅时混入了电子噪点。如果希望保持尽可能高的画质,应该使用低ISO感光度。但低感光度拍摄昏暗的室内或夜景,快门速度会非常低,所以需要注意很容易产生手抖动和被摄体抖动。此外,噪点本身有在昏暗部分比明亮部分更显眼的倾向。所以在室外明亮处拍摄照片时候将感光度提升到ISO 400 噪点不会太醒目。越提高ISO感光度快门速度就越高,可以有效防止手抖动和被摄体抖动。但在使用高感光度的时候,要注意画质劣化的问题。
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