Comparison of Sony r3 and m3 Direct Photographs

You probably mean the a7R3 and a7m3 models of Sony A7 series.

Sony a7R series are all high-pixel models, adopting Exmor R CMOS (Back-illuminated CMOS), and a7R3 reaches 40 million pixels. A7R4 even reaches 60 million pixels. This series is the high-end series of Sony Quan Huafu Micro-Single. It costs a lot. In order to adapt to 4K video shooting, the following models also adopted optimized stacked CMOS of back-illuminated CMOS.

A7m3 is a new popular Quan Huafu micro-single launched by Sony in 20 19, which has achieved a balance between performance and price. Exmor R CMOS is also used, but the pixel is controlled at the level of 24 million. Due to the expansion of single pixel area, the high-sensitivity image quality is better, and the exposure latitude is also increased. Its highest ISO has reached a frightening 204800(a7R3 can only reach 102400). The autofocus performance of a7m3 is as decisive and fast as a7R3. After listing, the reputation is very good and the price is approachable.

Now, the myth of high pixels has been shattered. If you don't pursue ultra-high pixels, a7m3 has the best cost performance.