Photographic special effects

It is well known that both background blur and intermediate blur are determined by the aperture value of the lens of a camera (SLR), not the post-special effects.

The special effect of shooting fireworks is also achieved by long-term exposure of the camera and recording the trajectory of fireworks burning.

In short, the special effects mentioned by the landlord are not post-produced by computer, but naturally formed when taking pictures!

You can see my QQ space, 29 160670.