When a photographer takes a group photo of the whole class with a camera with a fixed focal length, and then takes a bust of Xiaoming, then the photographer should

I took a group photo and a bust of Xiaoming. The image formed by the camera became larger, the image distance became larger and the object distance became smaller, so the distance between the camera and Xiaoming became smaller, and the distance between the lens and the film became larger.

The lens of a camera is equivalent to a convex lens, that is, the light reflected by the photographed object is refracted by the convex lens and concentrated on the negative film of the camera, and then an inverted and reduced real image can be formed on the negative film; Therefore, if a small beetle accidentally falls on the lens, the rest is still a convex lens, so a complete image can still be formed, but at this time, there is less light passing through the lens, so the image formed at this time should be darker than the original one.

So the answer is: reduce; Increase; Still.