1, the quality of digital camera mainly depends on four hard indicators, one is sensor quality, the other is lens quality, the third is image processing technology, and the fourth is control level. These four standards are applicable to all digital cameras, whether they are dual-reflex, SLR, non-reflex (micro-single) or portable (card machine);
2. Sensor quality. The three cameras mentioned by the landlord are all APSC frame sensors, commonly known as half-frame sensors (compared with Quan Huafu sensors), and the area is the same (the area of 700D is a little smaller, which can be ignored). According to the evaluation of DXO Mark Lab, the most authoritative third-party sensor evaluation organization in the world, D5300 has the highest achievement and the best quality. The results released by DXO are as follows: the total score of D5300 is 83, in which the color depth is 24, the dynamic range is 13.9, and the available high sensitivity is1336; The scores of K50 are 79 points, color depth 23.7, dynamic 13, and high sensitivity 1 129 respectively. The total score of 700D is 6 1, the color depth is 2 1.7, the dynamic color is 1 1.2, and the high sensitivity is 68 1 respectively. The sensor technical indicators of D5300 developed by Sony and trained by Nikon have won overall. At the same time, the D5300 sensor removes the low-pass filter, making the imaging sharper. D5300 sensor is the best;
3. Lens quality. The lens has a great influence on the image quality, which is very important. Judging from the quantity and quality of lenses and the support rate of lenses in the sub-factory, Canon and Nikon are equally matched, but Pentax is slightly weak. Canon's red circle head, Nikon's gold circle head and Pentax's star head are all good shots, but Canon and Nikon's lens groups are more powerful in number and variety, with rich bull's heads and dog's heads. Relatively speaking, Canon's resolution is slightly better than Nikon's lens of the same level, but Canon's image quality (including resolution) is dragged by the fuselage. According to the standard test of resolution 12233 and the evaluation by the German DP Review Laboratory, the most authoritative third-party camera comprehensive performance evaluation agency in the world, D5300 is the first, K50 is the second and 700D is the third.
4. Image processing technology. Canon's patented image processor D chip, Nikon's patented image processor E chip and Pentax Ricoh's patented image processor P chip are generally at the same level, but they all have different emphases. Canon pays more attention to noise suppression, portrait processing is very good, and the high sense is slightly stronger, but the disadvantage is that smear is more serious; Nikon pays more attention to detail reduction, and the imaging details are better, but the disadvantage is that the noise suppression of high sensitivity is slightly weak; Pentax pays more attention to color processing. The so-called Pentax Green is famous in the industry, but the details and high-sensitivity processing are not outstanding. Because the high sense of half a SLR is not a strong point, the advantages of Pentax and Nikon are more important. At the same time, the compression rates of the RAW format of the three cameras are different, because the SLR below the mid-range has no TIFF lossless compression format and no 16-bit RAW compression format, so the compression rate of the RAW format is more important. Both 700D and D5300 are 14 bit original compression, and K50 is 12 bit original compression. On the whole, the image processing technology of D5300 is more practical;
5. Control level. The control level of entry-level SLR is similar, and each has its own advantages. Among them, Canon's focusing technology is more advanced. (For example, although the 700D has only nine focus points, they are all cross-shaped corresponding to F5.6, and the center is double cross-shaped autofocus corresponding to F2.8), Nikon's configuration is more comprehensive (for example, the D5300 has the measuring point linkage function unique to Canon's high-end SLR). Pentax's body is kind (for example, K50 has a pentaprism view, 1/6000 shutter, dustproof and drip-proof, cold-proof metal frame body and so on). ). Generally speaking, the highlight of the K50 is the fuselage configuration, the highlight of the D5300 is the linkage of measuring points, and the highlight of the 700D is the cross focus, which is useful and incomparable.
6. Weighing the elements of the three cameras, the D5300 has the latest and best sensor, and the low-pass filter is removed, so the imaging is the sharpest. 39 camera is more convenient for the composition of focus, and point measurement linkage is very useful. But also supported by the powerful nikkor lens Group and the lens of the sub-factory. Relatively speaking, the advantages of D5300 are more practical.
Landlord reference.