As our optics expertise and manufacturing experience of optical lens and board camera lens, we collect S-mount M12 lens, M7 lens, and M5 phone lens modules with different focal length, view angle (FOV), and parameters in our online store.
A lens produces images in the form of a circle, called the image circle, also known as an optical format. In a camera module, the imaging element has a rectangular sensor area (the image size) that detects the image produced within the image circle. The ratio of the length of the horizontal to vertical sides of a video image is called the aspect ratio, which is normally 4:3 or 16:9 (H:V).
The lens optical format should match with the target image sensor like the leftmost photo in Figure3. If lens optical format and image size don’t match, it also works. But when the lens optical format is larger than the image sensor, the lens FOV will be reduced; and when the lens optical format is smaller than the image size there will be dark areas around the corners and some portion of the sensor area is not useful.
The FOV is also called the angle of view which is the shooting range that can be viewed by the lens given specified image size. It is usually expressed in degrees. Normally the angle of view is measured assuming a lens is focused at infinity. The angle of view can be calculated if the focal length and image size are known.