Traditional Culture Encyclopedia - Photography major - Apple 12 Why are all four corners of super wide-angle photography black?

Apple 12 Why are all four corners of super wide-angle photography black?

Black appears in the corner (actually not completely black, but darker than the central part ...), which is called "dark corner" in photography. ..... The appearance of dark corners is limited by technical conditions. At present, there is no way to completely eliminate it, only to minimize the adverse effects of dark corners. ...

As we all know, the lens is round. Therefore, its imaging image field is circular ... and the photosensitive element of the camera, whether it is film or image sensor, is square ... Therefore, the four corners of the film or image sensor are closer to the corners of the circular image field imaged by the lens ... This is partly because of the light input problem, and it will be relatively dark when imaging ... This is how the dark corner is generated.

At present, there is no complete solution to this problem ... even the highest-end lens, the top design and the best lens can't completely eliminate the dark corner ... So, it's normal to find the dark corner when shooting, so don't care too much.

Of course, if the dark corner is particularly dark and reaches the level of "black", it may also be caused by other reasons ... for example, the lens is blocked, resulting in insufficient light input ... for example, the camera is faulty and so on. ..... This needs to be analyzed according to the specific situation.