Canon EOS R100 Mirrorless Camera with RF-S18- vs Sony a7III Full Frame Mirrorless Camera with FE 28-
Updated August 2026 — Canon EOS R100 Mirrorless Camera with RF-S18- wins on portability, Sony a7III Full Frame Mirrorless Camera with FE 28- wins on battery life and features.
The Canon EOS R100 is an affordable and portable option for beginners, while the Sony a7III offers superior performance for serious photographers.
Why Canon EOS R100 Mirrorless Camera with RF-S18- is better
Price
Canon EOS R100 is significantly cheaper.
Portability
Canon is smaller and lighter.
Beginner-friendly
Canon has a simpler autofocus system.
Why Sony a7III Full Frame Mirrorless Camera with FE 28- is better
Image Quality
Sony has a full-frame sensor.
Autofocus
Sony has more autofocus points.
Video Capabilities
Sony offers superior video performance.
Overall score
Specifications
| Spec | Canon EOS R100 Mirrorless Camera with RF-S18- | Sony a7III Full Frame Mirrorless Camera with FE 28- |
|---|---|---|
| Sensor Type | APS-C | Full Frame |
| Autofocus Points | 143 | 693 |
| Video Resolution | 4K | 4K |
| Max ISO | 25600 | 204800 |
| Continuous Shooting | 6.5 fps | 10 fps |
Dimension comparison
Price Comparison
The Canon EOS R100 is priced at $579.00, making it about 69% cheaper than the Sony a7III, which retails for $1,898.00. This substantial price difference is noteworthy for budget-conscious consumers or those new to photography. While the Canon offers a more accessible entry point, the Sony a7III caters to enthusiasts and professionals who are willing to invest more for advanced features and performance.
Image Quality
Both the Canon EOS R100 and the Sony a7III deliver impressive image quality, but they cater to different user needs. The Canon boasts a 24.1-megapixel APS-C sensor, providing excellent clarity and detail for everyday photography. In contrast, the Sony features a 24.2MP full-frame sensor, which excels in low-light conditions and offers a dynamic range of 15 stops. This slight edge in image quality makes the Sony a7III the preferred choice for serious photographers who prioritize image performance.
Autofocus System
The autofocus capabilities of both cameras are impressive but differ in complexity. The Canon EOS R100 is equipped with a Dual Pixel CMOS AF system that covers 143 zones and features human face and eye detection, making it user-friendly for capturing sharp images. On the other hand, the Sony a7III boasts an advanced autofocus system with 693 phase detection points and 425 contrast detection points, delivering about 93% image coverage. This advanced system is particularly beneficial for fast-paced photography, such as sports or wildlife.
Video Capabilities
When it comes to video, the Canon EOS R100 supports 4K video recording at up to 24 frames per second, which is suitable for most casual videographers. It also allows for high-speed shooting, capturing HD video at up to 120 frames per second. Conversely, the Sony a7III offers 4K video recording with full pixel readout and no pixel binning, resulting in superior video quality. Its versatility in video performance makes the Sony a7III a better choice for content creators and filmmakers.
Portability
The Canon EOS R100 is designed with portability in mind, being the smallest and lightest camera in the EOS R series. Its compact design makes it easy to carry, especially for casual photographers who value mobility. In contrast, while the Sony a7III is still manageable, it is bulkier due to its full-frame sensor and additional features. Therefore, if you prioritize lightweight equipment, the Canon EOS R100 is the better option.
Battery Life
Battery life plays a crucial role in the usability of a camera. The Canon EOS R100's specifications do not detail battery life, but it is generally expected to be lower than that of the Sony a7III. The Sony a7III excels with a battery life of approximately 610 shots using the viewfinder and about 710 shots with the LCD monitor, making it more reliable for longer shooting sessions. For photographers who often shoot on location, the Sony’s superior battery performance is an essential factor to consider.
Included Accessories
In terms of bundled accessories, the Canon EOS R100 comes with a shoulder bag and a 64GB memory card, providing essential items for beginners. The Sony a7III, however, offers a more extensive package that includes not just the camera and lens, but also a variety of accessories such as an additional lens set, two 64GB memory cards, and a cleaning kit. This comprehensive bundle may appeal to those looking to get everything they need in one purchase, making the Sony a7III a better value proposition for serious users.
Which should you buy?
Choosing between the Canon EOS R100 and the Sony a7III ultimately depends on your photography needs and budget. The Canon EOS R100 is an excellent choice for beginners or casual photographers seeking a lightweight, affordable option with good image quality and basic video capabilities. However, for those willing to invest more for superior performance, especially in terms of image quality, autofocus, and video functionality, the Sony a7III stands out as a powerful tool for enthusiasts and professionals alike.

