Please help me explain the CCD and CMOS of digital camera, as well as the size problem.

metal

oxide

Semiconductor), complementary metal oxide semiconductor, voltage controlled amplifier device. It is the basic unit of CMOS digital integrated circuit. It is used to make photosensitive elements (TTL and CMOS are common) of digital imaging equipment, especially SLR digital cameras with large film size. Although the use of CMOS circuit is very different from the previous CMOS circuit as firmware or calculation tool, it basically adopts CMOS technology, which only converts the function of pure logic operation into receiving external light and then converting it into electric energy, and then converts the obtained image signal into digital signal through the analog-to-digital converter (ADC) on the chip.

CCD, English full name: charge coupling

Device, Chinese full name: charge coupled device. It can be called CCD image sensor. CCD is a semiconductor device, which can convert optical images into digital signals.

The tiny photosensitive substances implanted on CCD are called pixels. The more pixels a CCD contains, the higher the image resolution it provides. The function of CCD is just like film, except that it converts image pixels into digital signals, which are widely used in cameras, digital cameras and scanners, except that the camera uses dot-matrix CCD, which includes X and Y directions for shooting plane images, while the scanner uses linear CCD, which only has X direction, and the scanning in Y direction is completed by the scanner's mechanical device.

The less the number of CCD, the higher the resolution. At present, the best CCD is 3CCD. All professional digital cameras and some semi-professional digital cameras adopt 3CCD technology.

When you say 1: 2.33 and 1: 1. 18, it's not the size, but the sensitivity. Sensitivity of lens = lens focal length divided by beam diameter. The smaller the value, the larger the aperture and the stronger the sensitivity. Such a lens can make the photographic film live in sufficient light even if it is shot in low light. From the perspective of exposure, the stronger the photographic ability, the better the lens and the higher the price. Use 1: 1.2

1: 1.28

1:4 standard method, the smaller the denominator, the stronger the photosensitivity. The lens of 1: 1.8 is better than that of 1: 2.33.

The size of the photo after shooting.

You can adjust it according to your own needs. Want 1 inch

Any 2-inch will do.