Canon EOS R100 Mirrorless Camera RF-S18- vs Sony ILCE-7M3K/B a7 III 24.
Updated August 2026 — Canon EOS R100 Mirrorless Camera RF-S18- wins on value and ease of use, Sony ILCE-7M3K/B a7 III 24. wins on weight and battery.
The Canon EOS R100 is a budget-friendly option for beginners, while the Sony ILCE-7M3K/B offers advanced features for professionals.
Why Canon EOS R100 Mirrorless Camera RF-S18- is better
Price
Canon is significantly cheaper at $579.
Portability
Canon is the smallest and lightest in its series.
Beginner-friendly
Canon is designed for entry-level users.
Why Sony ILCE-7M3K/B a7 III 24. is better
Image Quality
Sony has a superior full-frame sensor.
Autofocus
Sony features advanced autofocus with more points.
Video Capabilities
Sony supports 4K HDR video recording.
Overall score
Specifications
| Spec | Canon EOS R100 Mirrorless Camera RF-S18- | Sony ILCE-7M3K/B a7 III 24. |
|---|---|---|
| Megapixels | 24.1MP | 24.2MP |
| Sensor Type | APS-C | Full-frame |
| Autofocus Points | 143 | 693 |
| Video FPS | 24 | 30 |
| Dynamic Range | N/A | 15 stops |
Dimension comparison
Overview of the Canon EOS R100 and Sony ILCE-7M3K/B
The Canon EOS R100 is priced at $579.00, making it significantly cheaper than the Sony ILCE-7M3K/B, which retails for $1,898.00. This price difference of about 70% makes the Canon a more budget-friendly option for those entering the mirrorless camera market. While both cameras deliver outstanding image quality, their target audiences differ greatly, with the Canon appealing to beginners and the Sony catering to more experienced photographers.
Image Quality Comparison
When it comes to image quality, both the Canon EOS R100 and the Sony ILCE-7M3K/B produce stunning photos. The Canon features a 24.1 Megapixel APS-C sensor, providing excellent clarity and detail, while the Sony boasts a 24.2MP Full-frame sensor, which is known for its superior low-light performance and dynamic range. The Sony offers a 15-stop dynamic range and 14-bit uncompressed RAW capabilities, which can significantly enhance post-processing flexibility. Thus, while both cameras excel in image quality, the Sony may be the better choice for those prioritizing advanced photographic features.
Autofocus Performance
In terms of autofocus, the Canon EOS R100 utilizes a Dual Pixel CMOS AF system with 143 zones, allowing it to effectively track subjects, including humans and animals. This system supports eye detection for improved focus accuracy. The Sony ILCE-7M3K/B, however, takes it a step further with 693 phase-detection and 425 contrast AF points, covering 93% of the image area. This advanced autofocus system allows for faster and more reliable focusing, especially in dynamic shooting situations. For users who prioritize speed and precision, the Sony camera provides a marked advantage.
Video Capabilities
Video recording capabilities are another key area where these two cameras differ. The Canon EOS R100 can shoot 4K video at 24 frames per second and Full HD video at 60 frames per second, making it a solid choice for entry-level videography. In contrast, the Sony ILCE-7M3K/B offers 4K recording with HDR capabilities and continuous shooting at up to 10 frames per second. This makes the Sony more suitable for professional video work, as it provides greater versatility and quality in moving images. Those focused on video production may find the Sony’s features more aligned with their goals.
Build and Design
The Canon EOS R100 is designed to be compact and lightweight, making it the smallest and lightest in the EOS R series. This portability is a significant advantage for users who value mobility and ease of use. Meanwhile, the Sony ILCE-7M3K/B, while still portable, is slightly heavier but offers a robust build that can withstand more demanding shooting conditions. This sturdiness can be beneficial for outdoor photographers or those shooting in challenging environments. Ultimately, the choice between these two designs will depend on individual preferences for portability versus durability.
Battery Life
Battery life is an important consideration for any camera user. The Canon EOS R100 is designed for efficient power use, allowing users to capture up to 6.5 shots per second, which can extend battery life during shooting sessions. However, specific battery longevity details are not provided. The Sony ILCE-7M3K/B features a more powerful battery that supports its advanced features while still providing a competitive shooting duration. This makes the Sony a better choice for extended shooting sessions, especially in professional settings where reliability is crucial.
Lens Compatibility
Both cameras come bundled with lenses that complement their capabilities. The Canon EOS R100 is paired with the RF-S18-45mm F4.5-6.3 IS STM lens, which offers versatility for various shooting scenarios, from wide landscapes to portraits. The Sony ILCE-7M3K/B comes with the SEL2870 lens, which is also versatile but may not match the flexibility offered by the Canon's lens in terms of focal lengths. For beginners looking for an all-in-one solution, the Canon's lens may be more appealing, while advanced users might prefer the lens options available for the Sony system.
Which should you buy?
Ultimately, the choice between the Canon EOS R100 and the Sony ILCE-7M3K/B depends on your specific needs and budget. The Canon, priced at $579.00, is about 70% cheaper than the Sony, making it an excellent choice for beginners or casual photographers who want a capable camera without breaking the bank. On the other hand, the Sony, priced at $1,898.00, offers superior autofocus, video capabilities, and overall performance, making it ideal for professionals and serious enthusiasts willing to invest more for advanced features. Each camera has its strengths, so consider what aspects are most important to you before making a decision.

