Canon RF100- vs Tamron 17-
Updated July 2026 — Canon RF100- leads on price and focal length.
The Canon RF100-500mm excels in specialized photography with its long reach and advanced features, while the Tamron 17-70mm offers versatility at a lower price point.
Why Canon RF100- is better
Price
Canon lens is designed for high-end telephoto photography.
Focal Length
Canon offers a super-telephoto range of 100mm to 500mm.
Optical Performance
Canon features advanced image stabilization and lens elements.
Why Tamron 17- is better
Price
Tamron is significantly cheaper.
Versatility
Tamron covers a standard zoom range suitable for everyday use.
Weight
Tamron is lighter and more portable.
Overall score
Specifications
| Spec | Canon RF100- | Tamron 17- |
|---|---|---|
| Max Aperture | F4.5-7.1 | F2.8 |
| Zoom Range | 100-500mm | 17-70mm |
| Stabilization | 5 stops | VC |
| Compatibility | Canon EOS R | Sony E APS-C |
| Close Focus | 3.0 ft | 7.5 in |
Dimension comparison
Price Comparison
The Canon RF100-500mm F4.5-7.1 L IS USM Lens is significantly more expensive than the Tamron 17-70mm f/2.8 Di III-A VC RXD Lens. Priced at $2898.95, the Canon lens costs about 384% more than the Tamron, which is priced at $599. This substantial price difference reflects the Canon lens's advanced features and capabilities, particularly for specialized photography such as sports and wildlife, where longer focal lengths are essential. Conversely, the Tamron lens offers a broader range of versatility at a much lower price point, making it an attractive option for everyday photography.
Camera Compatibility
Both lenses are designed for different camera systems, catering to distinct user needs. The Canon RF100-500mm is specifically compatible with Canon's EOS R series mirrorless cameras, making it ideal for Canon users seeking a high-performance telephoto option. In contrast, the Tamron 17-70mm is tailored for Sony E APS-C mirrorless cameras, offering a versatile zoom range suitable for a variety of shooting scenarios. This difference in compatibility means that users must consider their existing camera systems when choosing between these two lenses.
Focal Length and Zoom Range
The focal lengths of these lenses cater to different photography styles and subjects. The Canon RF100-500mm features an impressive zoom range of 100mm to 500mm, providing exceptional reach for distant subjects like wildlife or sports. This makes it a super-telephoto lens, suitable for specialized shooting situations. On the other hand, the Tamron 17-70mm covers a more standard zoom range of 17mm to 70mm, which is versatile for general photography, including landscapes, portraits, and everyday scenes. The choice between these focal lengths greatly influences the type of photography each lens excels in.
Optical Performance
In terms of optical performance, both lenses leverage advanced technologies to deliver high-quality images. The Canon RF100-500mm incorporates a combination of one Super UD and six UD lenses along with a built-in optical image stabilization system that offers up to 5 stops of shake correction. This ensures sharp images even in challenging conditions. The Tamron 17-70mm, however, features a maximum aperture of F2.8 across its zoom range and utilizes advanced lens elements, including two GM (Glass Molded Aspherical) elements, to achieve outstanding optical quality. While both lenses promise excellent performance, the Canon lens is particularly geared towards achieving clarity at longer distances.
Autofocus Capabilities
Autofocus performance is a critical aspect of any camera lens, and both products are equipped with advanced technologies to ensure quick and accurate focusing. The Canon RF100-500mm utilizes Dual Nano USM motors, providing high-speed, smooth, and quiet autofocus, which is crucial in dynamic shooting environments. The lens is designed to keep up with fast-moving subjects, making it ideal for sports and wildlife photography. Meanwhile, the Tamron 17-70mm features a VC (Vibration Compensation) system that enhances stabilization during video shooting and includes compatibility with Sony's Fast Hybrid AF and Eye AF capabilities. This makes it well-suited for both stills and video, particularly for social media content creators and vloggers.
Build Quality and Design
When it comes to build quality and design, the Canon RF100-500mm is constructed with L-series durability in mind, featuring dust and weather resistance to withstand challenging environments. Its fluorine-coated lens elements also resist dirt, moisture, and oils, making it reliable for outdoor use. The Tamron 17-70mm, while also moisture-resistant and equipped with a fluorine coating, offers a lightweight and compact design that enhances portability for everyday use. Users who frequently travel or require a lens for casual shooting may prefer the Tamron's design, while those working in more demanding conditions may lean towards the Canon's robust construction.
Intended Use Cases
The intended use cases for each lens further illustrate their differences. The Canon RF100-500mm is tailored for serious photographers who require a lens for specialized situations such as wildlife, sports, and aviation photography. Its long reach and superior image stabilization make it an ideal choice for these scenarios. Conversely, the Tamron 17-70mm is designed for everyday photography, making it suitable for a wide range of applications from family gatherings to casual street photography. This flexibility makes the Tamron lens an excellent option for photographers looking for a reliable all-around lens.
Which should you buy?
Ultimately, the choice between the Canon RF100-500mm F4.5-7.1 L IS USM Lens and the Tamron 17-70mm f/2.8 Di III-A VC RXD Lens depends on your specific photography needs and budget. If you require a high-end telephoto lens for specialized photography and are willing to invest significantly, the Canon lens is unmatched in performance. However, if you are looking for a versatile, high-quality lens for everyday use at a much lower price point, the Tamron lens stands out as an excellent choice. Consider your camera system, intended use, and budget carefully to make the best decision for your photography journey.

