Who should I choose for Pentax K-X, Nikon D90 and Canon D500?

Pentax Kx, of course. His high sensitivity, anti-shake and high-definition photos mainly benefit from the development history of 135 digital camera. In the early stage, it was an "expansion competition" of "pixel number", and all manufacturers were trying their best to increase the pixel number from the earliest 1 10,000 pixels to 24.6 million pixels. So far, it has caught up with the speed of home PC: photos with a side length of more than 6000 pixels have made ordinary computer users "unable to process photos". It is difficult to see more practical benefits except that the photos can be enlarged. Now, manufacturers have finally realized this "omission" and started to overcome the "quality" problem of photosensitive devices, and gained strategic development opportunities with "image quality breakthrough". Fuji developed EXR sensor, and Sony introduced high-speed parallel R sensor, which improved the clarity and high sensitivity of the sensor to a new stage.

Not to be outdone, Pentax introduced K20D digital SLR camera and14.6 megapixel CMOS sensor. Samsung's similar digital SLR camera is GX-20.

This CMOS sensor is jointly developed by Pentax and Samsung * * *, and is manufactured by Samsung, which deserves special attention.

One of the keys to the image quality produced by photosensitive devices is the area of each pixel. Although the number of pixels in some card machines has greatly increased, their total area has not changed, resulting in a significant decrease in unit pixel area and a decline in image quality.

Compared with Sony's12 million pixel sensor, Pentax sensor has14.6 million pixels, but the single pixel area is the same as that of12 million pixel sensor!

In other words: Pentax installed 2.7 million more pixels of the same size on the total area of APS-C (Pentax has applied for a patent for this technology)! Therefore, this image sensor is called "the industry's first ultra-high resolution sensor".

Pentax's photosensitive device is 20% lighter than before. In this way, when the anti-shake of the fuselage is turned on, the sensor displacement compensation is easier, the effect is greatly improved, and the critical shutter can be reduced by 2.5-4 levels, which is close to the anti-shake effect of the lens.

Another feature is that the pixels of the sensor are designed with ISO 1600 as the basic sensitivity. In other words, it is "innate" high sensitivity.

Pentax sensor also has the function of "automatic pixel repair"! By operating the camera button, you can repair the bad point on the sensor without sending it to a special repair shop.

Therefore, Pentax, a sensor with high resolution, high sensitivity, low noise, ultra-light weight and automatic repair of bad points, may be the most advanced CMOS sensor in the future. At present, Kx only uses this sensor. So Nikon D90, Canon 500D and Nikon D500 have fallen behind in sensors.