数码相机的光圈值越大越好还是越小越好啊 ?
比如光圈大小 F3.5-F4.3 好还是坏啊?
推荐回答(5个)
首要明白一个概念,光圈数(F)和光圈是一个反比关系。即F值越小,光圈越大。F值越大,光圈越小。
大光圈的优势:
1.大光圈通光量大,可以提升快门速度,在光线不足时更有利于手持拍摄;
2.在拍摄运动物体时,大光圈有利于配合高速快门,将运动的物体“凝固”;
3.大光圈最迷人的一个特性是:用大光圈拍摄,焦平面上的被摄物清晰,而焦外模糊(也就是人们常说的虚化)。说得通俗一些,如果你想让该清晰的地方清晰,不重要的地方模糊,就可以用大光圈,这有利于突出主体,常用于拍摄人像,比如室外人像艺术照。
深入理解光圈:
要理解什么是光圈,首先要了解相对孔径。相对孔径就是镜头的光孔直径与镜头焦距之比。假如照相机镜头的最大光孔直径是25mm,而焦距是50mm,那么这个照相机镜头最大相对孔径就是1/2。相对孔径的倒数,便称为镜头的光圈系数(又称F值)。那么,按照这个定义,上面举例中的最大光圈是2.0。因为光圈数是相对孔径的倒数,因此光圈数越小,镜头通过光线的能力越强。对照相机镜头而言,F值是个特别重要的参数,F值越小,镜头的适用范围越广。
人们在选择镜头时,当然要首选通光能力强的产品。由于大光圈镜头的制造工艺要求更高(大光圈时对边缘像场减小畸变的要求更高),在畸变差异不大的前提下,往往最大光圈越大,其价值也就越高。对专业镜头而言,F值从1.8到1.4,往往价格就会有数千元的上升。小光圈则比较容易实现,通过调整镜头中的光圈叶片而缩小相对孔径,便可以减少通光量,因此最小光圈一般都不用多虑。因此,在选择数码相机时,如果多款相机在技术指标上旗鼓相当,可优先选择F值小的。
光圈作为摄影中一个重要的参数,在理论上,硬件意义上的光圈是越大越好。这一点从大光圈镜头和较小光圈镜头的售价,或者“大三元”和“小三元”的售价就可以看出。
大光圈除了可以为我们带来漂亮的背景虚化效果外,还对在弱光线环境下的成像起到重要的作用。你想拍摄一个很好看的画面,由于光线不充足无奈没有脚架没有大光圈镜头是多么的遗憾。
光圈值的大小一般根据拍摄环境的亮度调节,亮度亮光圈值调小一点,反之调大一点.
光圈值的大小也与所要拍摄的像片的景深有关,光圈值大景深小,反之景深大.
同时光圈值的大小又与快门的速度有关,光圈值大快门的速度设快点,反之设慢点.
光圈值的大小还与ISO(感光度)有关,ISO 数值大光圈值小,反之...自己想吧。
总之,不能单纯地说光圈大好还是小好,应根据需要灵活设定.
光圈越大进光量越大,光圈越小则进光量越小,不能只看光圈大小判断相机的好坏的
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