The difference between back-illuminated camera and CCD

In the case of sufficient light, the imaging quality of CCD is still relatively good. The medium format digital cameras with a fuselage price of more than 70 thousand are CCD sensors.

CCD sensor does not perform well in weak light. Back-illuminated CMOS adopts back-illuminated technology, which is just the opposite of the design order of traditional CMOS and illuminates the side without wiring layer. Because it is not hindered by metal lines and transistors, the aperture ratio (the area ratio of photoelectric conversion part in a pixel) can be increased by nearly 100%. Compared with the previous interval of 1.75μm for surface irradiation products, back irradiation products have great advantages in sensitivity (S/N). In terms of signal-to-noise ratio (SNR), the back-illuminated CMOS image sensor has achieved high image quality, and its sensitivity has been improved by nearly 2 times, so the SNR of the newly developed CMOS image sensor has been improved by +8dB (sensitivity has been improved by +6dB, and noise has been reduced by -2dB).

Simply put, back-illuminated CMOS performs better in the case of insufficient light, and this advantage is more obvious on card machines with small sensors, and it is easier to realize high-speed continuous shooting of high-definition cameras.

In addition to Sony, the Canon card machine model with "HS" also uses Sony's back-illuminated CMOS sensor, and Nikon, Casio, Ricoh and other manufacturers also use Sony's back-illuminated CMOS sensor, with good performance. Well, Fuji also has its own back-illuminated CMOS technology sensor.

For example, Canon IXUS/KOOC-0//KOOC-0/5HS, IXUS 3/KOOC-0/0HS, Nikon S9/KOOC-0/00, Casio Zr/KOOC-0/00, Fuji F505EXR, Ricoh CX5, Pentax Q and so on. Well, in fact, except for a few brands (such as Panasonic and Samsung), most of the card machines listed this year use back-illuminated CMOS, and digital products are bought new instead of old ones.