Why is the image quality of 5D2 better than that of hundreds of thousands of cameras (Panasonic AJ-HDC27HMC)?

Your calculation is correct. The area of Quan Huafu CCD is larger than that of 2/3 inch CCD, but considering that all broadcast cameras are 3CCD, the total area is still more than 7D.

2/3 inch should be the diagonal length.

The resolution of the camera is much smaller than that of the camera, even in high definition, it is only 1920X 1080, so the camera is much larger in terms of the area per pixel, so the low illumination of the camera is better than that of the camera.

The processing circuit accounts for a large part of the price of the camera, and you can tell by its size. Because it is necessary to ensure long-term video shooting and recording, it is more expensive, and of course there are sales factors.

Answer supplement

A single ccd photosensitive device is also sensitive to three colors respectively. Each pixel of a single CCD consists of three very close photosensitive units. Color filters are installed in front of the three photosensitive units, which are sensitive to red, green and blue respectively. Therefore, if only the photosensitive area of one color is compared, the photosensitive area of a single CCD should be divided by three. Seen from here, it is the same as 3CCD, except that the three colors of each pixel of 3ccd completely overlap in space, and the area is larger.

Because there is a certain distance between each photosensitive unit and the adjacent photosensitive units, it is impossible to get close to each other, so the actual photosensitive area is always smaller than the CCD area. Therefore, the concept of aperture ratio is introduced, that is, the ratio of CCD area to actual photosensitive area. In order to increase the aperture ratio, a condenser is added in front of each photosensitive unit, and the condenser can be close to each other to increase the light input of the photosensitive unit.

The area of Quan Huafu is 22.3* 14.9=332.27.

2/3 inch CCD area (approximate value)13.5 *10.125 =136.6875 * 3 = 410.0625.