Canon RF100- vs Sigma 17-
Updated July 2026 — Canon RF100- wins on price and zoom range, Sigma 17- wins on aperture.
The Canon RF100-500mm excels in telephoto performance, while the Sigma 17-40mm offers versatility at a lower price.
Why Canon RF100- is better
Telephoto Range
Superior zoom range for wildlife and sports photography.
Stabilization
Advanced image stabilization for handheld shooting.
Build Quality
Rugged construction suitable for challenging conditions.
Why Sigma 17- is better
Price
Significantly more affordable option.
Weight
Lighter and more portable for everyday use.
Aperture
Constant F1.8 aperture for low-light performance.
Overall score
Specifications
| Spec | Canon RF100- | Sigma 17- |
|---|---|---|
| Focal Length | 100-500mm | 17-40mm |
| Max Aperture | F4.5-7.1 | F1.8 |
| Image Stabilization | Yes | No |
| Auto Focus | Dual Nano USM | Standard AF |
| Compatibility | Canon EOS R | Sony E-mount |
Dimension comparison
Introduction to the Canon RF100-500mm and Sigma 17-40mm
In the realm of camera lenses, the Canon RF100-500mm F4.5-7.1 L IS USM and the Sigma 17-40mm F1.8 DC stand out as notable contenders. The Canon lens, priced at $2,898.95, is designed for wildlife and sports photography with its super-telephoto capabilities, while the Sigma lens, at $919.00, is tailored for low-light shooting and creative depth effects. Each lens serves different photographic needs and styles, making them suitable for different types of photographers.
Design and Build Quality
The Canon RF100-500mm features a robust L-series construction with dust and weather resistance, making it ideal for challenging shooting conditions. Its compact design, despite the long focal length of 100mm to 500mm, allows for travel-friendly portability. In contrast, the Sigma 17-40mm, while also designed for durability, focuses on a lightweight and ergonomic build suitable for everyday use. The Canon lens is more rugged, which might appeal to outdoor photographers, while the Sigma lens is crafted for versatility and ease of use.
Optical Performance
Optically, the Canon RF100-500mm is built with advanced elements including one Super UD and six UD lenses, ensuring sharp and high-resolution images, especially at long distances. Its optical image stabilization system offers up to 5 stops of shake correction, which is crucial for handheld shooting in dynamic environments. Meanwhile, the Sigma 17-40mm boasts a constant F1.8 aperture throughout its zoom range, providing excellent low-light performance and depth of field control. While the Canon excels in long-range shots, the Sigma delivers sharp detail for portraits and landscapes.
Focusing Capabilities
The Canon RF100-500mm is equipped with Dual Nano USM for fast, smooth, and quiet autofocus, which is essential when photographing fast-moving subjects like wildlife. This is particularly advantageous in sports photography, where timing is critical. The Sigma 17-40mm, while also providing good autofocus performance, is more suited for creative photography where depth and detail matter. It may not match the speed of the Canon's autofocus in action scenarios, but it shines in controlled environments.
Price Comparison
With a price tag of $2,898.95, the Canon RF100-500mm is significantly more expensive than the Sigma 17-40mm, which is priced at $919.00. This places the Sigma lens at about 68% cheaper than its Canon counterpart. The price difference reflects the specialized nature of the Canon lens, which caters to professional photographers seeking high-quality telephoto performance. The Sigma lens, on the other hand, offers excellent value for those in need of a versatile zoom lens for everyday shooting.
Intended Use Cases
The Canon RF100-500mm is particularly suited for sports, wildlife, and aviation photography, thanks to its super-telephoto zoom range and advanced stabilization features. This makes it a go-to option for professional photographers who require high performance in challenging conditions. Conversely, the Sigma 17-40mm is ideal for travel, portraits, and video, making it a versatile choice for hobbyists and enthusiasts who favor a broader range of photographic styles. Each lens caters to distinct use cases, highlighting their respective strengths.
Compatibility and Versatility
The Canon RF100-500mm is specifically designed for Canon's EOS R series mirrorless cameras, ensuring seamless integration and optimal performance. Its compatibility with these cameras means users can take full advantage of Canon's advanced imaging technology. On the other hand, the Sigma 17-40mm is designed for Sony E-mount APS-C cameras, making it an excellent lens for Sony users looking for quality and versatility. The choice between these lenses largely depends on the camera system the photographer is using.
Which should you buy?
Choosing between the Canon RF100-500mm F4.5-7.1 L IS USM and the Sigma 17-40mm F1.8 DC ultimately depends on your photographic needs and budget. If you require a high-performance telephoto lens for action and wildlife photography and are willing to invest significantly, the Canon lens is the superior choice. However, if you are looking for a more budget-friendly option that provides versatility for everyday shooting, the Sigma lens is an excellent alternative. Each lens has its strengths, and your choice should align with your specific photographic goals.

