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Because they both use the same sensor, the A7C and A7 III feature almost identical autofocus hardware. This implies that they both have a hybrid system with 693 phase-detection focus points and 425 contrast-detection focus points, which is the same as a conventional system. The A7C, on the other hand, has a 1EV higher sensitivity, which implies it works somewhat better in low light. The Sony A7C was released in September 2020 as the company's entry-level full-frame mirrorless camera, placing it below the earlier Sony A7 III in the company's product line-up.
Sony Alpha a6400
Each of the cameras has a body that is similar to the other (Rangefinder-style mirrorless). Essentially, the new A7C is a rangefinder-style camera in the same vein as the previous A6000 series, although it's somewhat larger and, more remarkably, it has a full-frame sensor at its core rather than an APS-C sensor. Despite the change in sensor size, the A7C and the A6600 are quite similar in terms of size, weight, and overall appearance.
There are three sequential viewpoints available: from the front, from the top, and from the rear. The Sony A6400, on the other hand, does not have this function, which means you will need to purchase a lens that has optical stabilization. Currently, there are 35 lenses available for the Sony E mount that have Optical Image Stabilization. Secondly, a dedicated memory card slot has been added to the A7C, which is concealed behind a lockable door on the left-hand side of the camera body. The A7C features a quicker SD UHS-II memory card port, but the A6600 has a slower UHS-I memory card slot, which is seen in the older Sony A7. Because of its vari-angle screen, the A7C is a tiny camera that is ideally suited for travel and vlogging; but, the A7 III provides a more satisfying overall handling experience for all other types of photographic endeavors.
Sony Alpha A7c vs Sony Alpha a6400
Comparison between the Sony A7c with the Sony A6400
It is expected that bigger sensor units will have larger individual pixels, which will enable higher low-light sensitivity, broader dynamic range, and more vibrant colors in the same technical generation as smaller pixel-units in a sensor of the same technological generation. As an added bonus, a big sensor camera will provide the photographer with additional opportunities to employ narrow depth-of-field to isolate a subject from its surroundings. Larger sensors, on the other hand, are more costly and result in larger and heavier cameras and lenses, which are less portable. DXO Mark provides accurate and consistent information on real sensor performance for a wide range of cameras.

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Sony Alpha a6400 Sony Alpha A7c
The connection capabilities of the Sony Alpha A6400 and Sony Alpha A7C are summarized in the table below. Of particular note are the interfaces the cameras offer for accessory control and data transmission, which are detailed further below. One distinction between the two cameras is the presence or absence of an on-board flash on the camera body. While the A6400's built-in flash is not very bright, it may be helpful as a fill-in light in some situations. Before we get into the details of the comparison, here's a quick rundown of how the A7c compares to the A6400 in terms of mobility, imaging, features, and overall rating. Take care of those 8K RED files like a pro. The A7c was introduced 21 months after the A6400, placing the two cameras a generation apart in terms of technological advancement.
When compared to the A6600, the A7C sports a 0.39-inch, 2.36-million-dot XGA OLED electronic viewfinder that is remarkably comparable to the A6600. When compared to the other A7-series cameras, both cameras feature an electronic viewfinder (EVF) that is positioned in the left-hand corner and a streamlined UI with fewer controls. With 425 phase-detection contrast detection points that span 84 percent of the frame, the A6600 is capable of operating in low light conditions as dark as Sony Alpha A7c and Sony Alpha a6400 - 2EV, according to the manufacturer. On the A7C, there are 693 phase-detection points and 425 contrast-detection points that cover 93 percent of the frame, with the system capable of functioning in low light as low as -4EV. The system is capable of working in low light as low as -4EV. This is the most significant distinction between the A7C and the A6600, and it is the primary reason you should select one over the other when choosing a camera.
Sony Alpha a6400 Sony Alpha A7c
However, there are a few more distinctions that offer the A7C an advantage, the most notable of which are the auto-focusing feature as well as the memory card slot and LCD screen. As a result, purchasing the full-frame camera rather than the APS-C body costs around £$500 more, with the price gap narrowing even further when comparing the kit lens combinations, which, in our opinion, is probably well worth it. Furthermore, since the viewfinder is incorporated into the body of the A7C, the camera has a more rectangular design, with the viewfinder located in the top-left corner. As a result, the A7C has the appearance of one of Sony's APS-C format cameras rather than one of the A7-series of full-frame models, which is a good thing.
Unlike the A7C, which has a single SD/SDHC/SDXC slot that is compatible with both UHS-II and UHS-I media, the A7 III has two card slots, one of which is compatible with UHS-I media and the other of which is compatible with both UHS-I and UHS-II cards. Unlike the A7C, which has a single SD/SDHC/SDXC slot that is compatible with both UHS-II and UHS Both the Sony A7c and the Sony A6400 feature 24.0 MP resolution sensors, however the sensor on the Sony A7c is Full frame (35.8 x 23.8 mm) while the sensor on the Sony A6400 is APS-C. (23.5 x 15.6 mm ). Another consideration is weight, which is particularly significant when choosing a camera that you will be carrying about with you all day. It is worth noting that the Sony A6400 is substantially lighter than the Sony A7c, which may prove to be a considerable benefit on lengthy walks. As a result, it comes down to size vs focal range, with the A7C taking first place in the former and the A6600 taking first place in the latter.
Comparing the Sony A7C to the A6600, its launch pricing makes a little more sense than when comparing it to the A7 III, which makes sense when comparing it to the A7 III. However, it has a lesser magnification of 0.59x, compared to the A6600's magnification of 0.70x. This is critical since the A6600 has a higher magnification of 0.70x. In addition, it contains two Custom function buttons on the top-panel, which are quite popular among users. On the newer A7C, the exposure compensation dial has largely taken the position of the previously mentioned dials.
The combination of the Sony FE 28-60mm lens with the Sony A7C camera is much lighter and smaller in volume than the Sony A6600 and the FE mm combo. Surprisingly, the A6600 can shoot 810 photos with the LCD screen and 720 photos with the EVF, outperforming its newer sister by a wide margin. It is the same big capacity NP-FZ100 battery that was used in the Sony A6600 model that is used in the Sony A7C.

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