The four feet of the photo darken. All cameras have this problem. The lens itself has more light passing through the middle part, but less light at the edge. Generally speaking, the gap is not big. Generally, you can find a setting to eliminate the dark angle on the fuselage, which can be corrected. Then you can adjust the brightness of the angle freely in the ACr of PS. Then there is an error that you shouldn&;t make. You use a half-frame lens on the Quan Huafu fuselage, and the image field of the lens is not enough, resulting in a dark angle.