Talk about the characteristics of macro photography from the aspects of object distance, image distance and focal length! ! ! ! !

Object distance: u image distance: v focal length: f Relationship:1/u+1/v =1/f That is, the reciprocal of object distance plus the reciprocal of image distance equals the reciprocal of focal length.

When the object distance is infinite, the image distance is equal to the focal length, and the image is formed on the focal plane (when the camera focuses on infinity);

When the object distance is equal to twice the focal length, the image distance is equal to the object distance. At this point, the objects and images are equal, which is the case with the macro of 1: 1

Macro photography also has an exposure compensation problem.

Exposure compensation = (image distance/focal length) square-1 However, modern cameras have metering systems that contain light attenuation factors and do not need compensation.