In SLR photography, how to turn the fuzzy bicycle taillights into five-pointed stars or other shapes without PS?

It's not too difficult. You can have taillights of any shape. It's also fun, but it's a little troublesome to introduce it to you. I'll try to be careful. If you don't understand, you can ask again . .

Find a piece of black cardboard, check your lens size and cut it into a circle. Note that there are three or four protruding claws around the circle, which is convenient to tie the lens with a rubber band. Cut out a five-star shape at the center of the circle with a sharp knife, the size should not be too big, that is, about 1.5 cm, and then buckle the round black cardboard in front of the camera and fix it with a rubber band. Turn on the camera, turn the aperture to the maximum, change the focusing mode to manual, set up a tripod and shoot. Relevant experience depends on your own experience. It is best to choose an environment with more light, so that the blurred starry sky effect will be more abundant. If you want to change the shape of the lamp, you can change the shape of the sculpture. Strictly speaking, the best shooting method for this effect is fixed focus, and the lenses with apertures of 1.4 and 1.8 are better, which can achieve faster speed. However, I have taken shots with the maximum aperture of 2.8 and 3.6, and I can still see them alive. I'll give you an effect picture I took. Taking photos by hand is a bit empty.