Will it rain if you don't slow down the shutter on rainy days?

According to your question, you want to shoot "rain trail", don't you?

First of all, you need to know how to make "smear". We all have this experience. In the dark environment, there will be "smear shadow" when shooting moving people or objects, which is called "paste shadow" in photography, which is basically equivalent to "raindrop imprint".

Why?

First, the photos have exposure time, as shown below:

1/50 is the exposure time, which means the' duration' in the process of taking this photo. If the raindrops move a certain distance during this time, and your mobile phone has been taking pictures during this time, you can record the "rain trail".

Second, the speed of raindrops.

The raindrops in the air are accelerating at first, and with the increase of speed, to a certain extent:

So the speed is related to the coefficient k, which is about 4 m/s.

Third, the length of the rain trail.

L=V*S？ L: track length? V: What is the ending speed of raindrops? time of exposure