What are the uses of both cameras on Apple 7plus?

What are the uses of iPhone7plus dual camera? iPhone7plus dual camera function

The newly added lens of iPhone7 Plus is a wide-angle lens, that is to say, one wide-angle and one telephoto. This is equivalent to shooting the same thing with two cameras, and then combining it with the algorithm to give it two advantages at the same time. In terms of specific effects, the background blur can be achieved very well, and the blur can be automatically achieved through the API chip, because the depth of field can be automatically recognized.

Theoretically, two 12-megapixel cameras can take photos with nearly double the definition through algorithm synthesis, and can capture more picture details during the actual photo taking process. What is particularly worth mentioning is the focus. The dual cameras do not need to focus in advance when taking pictures. You only need to align the screen and click the button to complete the shooting. The phone will automatically save the photos with different focal lengths. After taking the photos, click anywhere on the photo to re-focus. The focus function means that the human eye effect can be achieved when taking pictures with a mobile phone. In fact, the dual camera is an application that simulates the human eye.

The addition of a "telephoto" lens is undoubtedly an important step in allowing mobile phones to achieve true background blur. In addition to the shallower the depth of field the larger the aperture is, the longer the focal length is and the shallower the depth of field is. This is also the most beautiful step that I think Apple has done in upgrading its mobile phones this time. This is not only a big step towards professional photography, but also a slap in the face to all Android phones that use algorithms to achieve out-of-focus blur effects. Although Apple phones before the iPhone 7 Plus can blur the background when shooting small objects, this can only be done when the shooting distance is extremely close. This time, the iPhone 7 Plus can achieve this with the help of twice the optical zoom.

Camera Principle

The camera lens is a convex lens.

The camera is made using the principle that a convex lens can create an inverted, reduced, and real image.

Meet the condition: when the object distance is greater than twice the focal length, (u>2f)

When the camera becomes farther away from the object being photographed, the lens retracts back, and the captured image becomes smaller;

(Beyond twice the focal length, when u becomes larger, v becomes smaller, and the image becomes smaller)

When the camera gets closer to the object being photographed, the lens extends forward , the captured image becomes larger.

(Beyond twice the focal length, when u becomes smaller, v becomes larger, and the image becomes larger)