目前，尼康(Nikon)和索尼(Sony)等多家公司推出的最新防抖技术号称能将安全快门减少约四档。例如，一个200mm的焦距镜头有一个1/200秒的安全快门。anti-shake打开,200/24 = 13,在1/13秒的快门速度,仍有一定的概率可以清晰的图片,我们知道,根据正常的经验,这比一个安全快门速度慢得多,和普通手持设备不太可能拍清晰照片。
Many friends think that my photo was taken because it was shaken, so I am confused. Is n’t it that the camera (lens) has anti-shake function, it wo n’t be blurred because of hand shake?
To understand this problem, it is necessary to return to a basic concept: safe shutter speed.
The principle of safe speed for handheld camera shooting: safe speed is the reciprocal of focal length. If a 35mm lens is used, the shutter speed must not be lower than 1/35 second, and when using a 200mm lens, the speed must not be lower than 1/200 second, otherwise the picture may be blurred.
Knowing this rule, it is easy to understand that, since our camera hands are always more or less jittery, "shooting" is because the light is too dark and the shutter speed cannot reach the safe shutter speed. The anti-shake function allows us to take clear pictures at a speed lower than the safe shutter speed.
Well, one conclusion that can be drawn first is that we don't need anti-shake when there is enough light.
What is enough light? We can roughly think that during the daytime, outdoor light is basically a safety shutter with enough light to reach a focal length of 100mm or less, and in the early morning and evening when the weather is bad, shooting at night, and indoors, it is a more common low-light scene.
At present, the latest anti-shake technology of several companies from Nikon and Sony claims to reduce the safety shutter by about four stops. For example, a 200mm focal length lens has a safety shutter of 1/200 second. With anti-shake turned on, 200/24 = 13, At a shutter speed of 1/13 seconds, there is still a certain probability that you can take a clear picture, and we know that according to normal experience, this speed is much slower than a secure shutter, and ordinary handhelds are unlikely to take clear pictures.
With the above knowledge, we can draw another conclusion: the anti-shake function can only offset part of the jitter in specific scenes, not the complete "anti-shake". For example, in the example above, if the shutter speed is lower than 1/13 seconds, then even the image stabilization is powerless. However, the light intensity of our indoor and night scenes is usually lower than 1/10 seconds, or even a few seconds. Seconds, many friends usually take pictures of night scenes by hand, or shoot people indoors. If you want to use the anti-shake function, you can shoot clearly. I want to say: It's still difficult.
To sum up: The anti-shake function can only improve the success rate of clear hand-held shooting in low light conditions. If the light is strong-for example during the day-then we can shoot clearly without anti-shake, the light is too weak-for example at night-the anti-shake will not help.