Capturing fast-moving subjects like kids, pets, or sports can be frustrating when your camera loses focus mid-action. That is where a mirrorless camera with robust continuous autofocus transforms your shooting experience. In this guide, we evaluate two top contenders for 2026: the Sony Alpha a6400 Mirrorless Camera and the Canon EOS R100 Mirrorless Camera with 18-45mm. Whether you are a vlogger, a portrait enthusiast, or a travel photographer, these cameras deliver reliable focus tracking to keep your images sharp. For a deeper look at Sony’s mirrorless lineup, check out our best sony mirrorless cameras in 2026 article.

Buying Guide

Autofocus System Type

Continuous autofocus performance hinges on the type of phase-detection points and their coverage across the sensor. The Sony Alpha a6400 uses 425 phase-detection points covering 84% of the frame, paired with Real-Time Eye AF for humans and animals. This hybrid system locks onto moving subjects quickly, even when they turn away. In contrast, the Canon EOS R100 employs Dual Pixel CMOS AF with Eye Detection AF across the entire frame, ensuring responsive focus for portraits and action scenes. Both cameras excel in this category, but the Sony offers slightly faster acquisition in low light.

Continuous Shooting Speed

For sports or wildlife, a fast burst rate paired with continuous autofocus is essential. The Sony a6400 shoots up to 11 frames per second with full autofocus tracking, letting you capture decisive moments without blur. The Canon EOS R100 offers a more moderate burst rate, but its mechanical shutter still supports reliable series shooting. If you prioritize speed, the Sony is the clear winner. Learn more about Canon’s mirrorless options in our best canon mirrorless cameras reviewed for 2026 guide.

Lens Compatibility

Lens selection affects autofocus accuracy and versatility. The Sony a6400 uses the E-mount system with a wide range of native lenses, including fast primes and telephoto zooms. Many third-party options from Sigma and Tamron also support continuous autofocus. The Canon EOS R100 is part of the RF mount ecosystem, offering native RF-S lenses for APS-C and full-frame RF lenses. The bundled 18-45mm and 75-300mm lenses cover common focal lengths, but expanding your kit may be costlier. For beginners, the Canon kit provides a complete starting point; see our Best Canon Mirrorless Cameras for Beginners in 2026 for more.

Video Autofocus Performance

Vloggers and content creators rely on smooth, continuous autofocus during video recording. The Sony a6400 supports Real-Time Tracking in 4K video, keeping subjects in sharp focus even as they move across the frame. The Canon EOS R100 also uses Dual Pixel CMOS AF for video, offering reliable tracking during slow pans or interviews. However, the Sony’s faster processing and higher burst speed translate to more responsive focus in dynamic scenes. If video is your primary focus, explore our best canon mirrorless cameras for video post.

Final Thoughts

Both Sony Alpha a6400 Mirrorless Camera and Canon EOS R100 Mirrorless Camera with 18-45mm deliver excellent continuous autofocus for different user needs. The Sony a6400 wins for speed, low-light performance, and advanced eye tracking, making it ideal for action photographers and vloggers. The Canon EOS R100 bundle offers a complete beginner-friendly kit with solid dual-pixel autofocus, perfect for families and travel enthusiasts stepping into mirrorless photography. Choose the Sony if you need top-tier tracking, or pick the Canon for an affordable all-in-one starter setup.

Frequently Asked Questions

What is continuous autofocus and why does it matter?

Continuous autofocus (AF-C) keeps a moving subject in focus by constantly adjusting the lens. It is essential for capturing sports, wildlife, and active children without blurry shots. Both the Sony a6400 and Canon EOS R100 offer effective continuous AF with eye detection to maintain sharpness.

Which has better continuous autofocus: Sony a6400 or Canon EOS R100?

In side-by-side evaluations, the Sony a6400 exhibits faster and more tenacious tracking, especially with moving subjects in low light. The Canon EOS R100 provides reliable, smooth autofocus for portraits and moderate action, but it may struggle with very fast or erratic movement. Your choice depends on the shooting speed you need.

Do these cameras work well for video autofocus in 2026?

Yes, both cameras support continuous autofocus during video recording. The Sony a6400 uses Real-Time Tracking for steady 4K footage, while the Canon EOS R100 relies on Dual Pixel CMOS AF for smooth transitions. For beginners in vlogging, the Canon bundle includes two lenses that cover typical shot ranges. See our best canon mirrorless cameras for video for more details on video performance.

Can I use third-party lenses with continuous autofocus on these cameras?

On the Sony a6400, many third-party lenses from Sigma, Tamron, and Samyang support continuous autofocus via the E-mount. For the Canon EOS R100, only native RF lenses and some adapted EF lenses may offer full AF-C compatibility. Always check compatibility lists from the manufacturer before purchasing.