How to judge whether the camera is moldy or stained?

If there are color spots on the lens of the camera, and they can't be wiped off, it means that the lens has mildew spots, otherwise it is a stain.

Digital camera, English full name: digital camera? (DSC), abbreviated as: digital camera (DC), is the abbreviation of digital camera, also known as: digital camera. Digital camera is a kind of camera that uses electronic sensors to convert optical images into electronic data.

According to the use, it is divided into: SLR camera, micro camera, card camera, telephoto camera and household camera. The principle of digital camera recording images on film through silver bromide's chemical changes is different from that of ordinary cameras. The sensor of digital camera is photosensitive charge coupled device (CCD) or complementary metal oxide semiconductor (CMOS).

Before an image is transmitted to a computer, it is usually stored in a digital storage device (usually using flash memory; Floppy disks and rewritable compact discs (CD-RW) are rarely used in digital camera equipment.

principle of operation

Digital camera is a product integrating optics, machinery and electronics. It integrates the conversion, storage and transmission of image information, and has the characteristics of digital access, interactive processing with computer and real-time shooting. Light enters the camera through a lens or lens group, and is converted into a digital signal through an imaging element of a digital camera, and the digital signal is stored in a storage device through an image operation chip.

The imaging element of digital camera is CCD or CMOS, which is characterized in that when light passes through it, it can be converted into electrical signals according to different light. Digital cameras first appeared in America. More than 20 years ago, the United States used it to transmit photos to the ground via satellite. Later, digital photography was converted to civilian use, and its application scope continued to expand.