Why does the photo of SLR camera look smaller than the real thing? How to adjust it?

For the object in the photo, the human brain often judges its size according to experience and with the help of reference objects in the surrounding environment. If the reference object is deliberately enlarged by using the perspective principle, it may give the observer the illusion that the reference object becomes smaller. This way can make funny pictures, which is called "illusion photography". As the picture shows, the characters and their hands are taken very close to the camera, and a group of people standing in the distance are like little ants.

If you want to take a picture of a commodity and let the buyer recognize its size, you must use common things as a reference. For example, you can put a No.5 battery or a pack of cigarettes whose size is known to all, so that you can judge the size of the object by reference.

No matter the size of this photo, the viewer will not make a wrong judgment. draw