The “Sensor 1/1.7″⋅Φ5.6” marked on the lens contains the sensor size and lens aperture diameter information, and the specific meanings are as follows:

Sensor 1/1.7 Φ5.6

1/1.7″: Indicates the size of the sensor. The “1/1.7 inch” here refers to the length of the sensor diagonal, which is 1/1.7 of 1 inch, or about 7.6 mm (in actual calculations, 1 inch equals 25.4 mm, so 1/1.7 inch is approximately equal to 14.94 mm, but usually in the representation of sensor size, it is simplified to a close value, such as 7.6 mm or similar values, to indicate the size of the sensor). Sensor size is one of the important factors affecting camera image quality. Generally speaking, the larger the sensor size, the better the image quality, especially in low-light environments.Recommended reading:Fisheye Board Lens.

Φ5.6: The “Φ” here is the symbol for diameter, indicating that the aperture diameter of the lens is 5.6 mm (but please note that the Φ5.6 here does not directly refer to the aperture size. The aperture size is usually expressed in F values, such as F1.2, F2.8, etc. The 5.6 here is more likely to refer to the diameter of the front lens group of the lens or a specific size parameter related to the aperture. The specific understanding needs to be combined with the lens design). However, in conventional understanding, the lens label may not directly indicate the aperture diameter in this way, but will mark other parameters such as the aperture value (F value) or focal length. The Φ5.6 here may be a size mark in a specific lens design, which may be related to the physical size or optical design of the lens.