Canon RF 24- vs Sigma 18-
Updated July 2026 — Canon RF 24- wins on stabilization and zoom, Sigma 18- wins on price and weight.
The Canon RF 24-105mm offers superior versatility and optical performance, while the Sigma 18-50mm is a compact and budget-friendly option.
Why Canon RF 24- is better
Zoom Range
Canon offers a broader zoom range from 24mm to 105mm.
Aperture
Canon has a constant f/4 aperture across the zoom range.
Stabilization
Canon features a five-stop image stabilization.
Why Sigma 18- is better
Price
Sigma is significantly cheaper at $587.
Weight
Sigma is smaller and lighter, enhancing portability.
Aperture
Sigma has a faster f/2.8 aperture for low light.
Overall score
Specifications
| Spec | Canon RF 24- | Sigma 18- |
|---|---|---|
| Focal Length | 24-105mm | 18-50mm |
| Max Aperture | f/4 | f/2.8 |
| Image Stabilization | Yes | No |
| Weight | 1.5 lbs | 0.9 lbs |
| Compatibility | Canon RF | Sony E |
Dimension comparison
Overview of the Canon RF 24-105mm and Sigma 18-50mm
The Canon RF 24-105mm f/4L is USM Zoom Lens is a versatile option with a broader zoom range, while the Sigma 18-50mm F2.8 DC DN Contemporary offers a compact alternative at a significantly lower price. The Canon lens is priced at $1,399.00, whereas the Sigma lens is about 58% cheaper at $587.00. Both lenses cater to different photography needs, making them suitable for various users.
Build Quality and Design
The Canon RF 24-105mm features a compact and high-quality design that is part of Canon's L-Series, known for its durability and performance. With its first-ever Nano USM technology, it offers smooth and fast autofocus. Conversely, the Sigma 18-50mm is notably small and light, making it an excellent choice for photographers seeking portability. The Sigma lens combines advanced optical performance with a compact design, ensuring that it remains manageable for daily use.
Optical Performance
When comparing optical performance, the Canon RF 24-105mm excels with its constant f/4 maximum aperture across the zoom range. This is advantageous for achieving consistent exposure in varying lighting conditions. The lens also features a five-stop-effective image stabilizer, which helps reduce camera shake, making it ideal for handheld shooting. On the other hand, the Sigma 18-50mm offers a versatile f/2.8 aperture. Although it has a shorter focal range, it delivers superb optical quality and in-camera aberration correction, ensuring that images remain sharp and vibrant.
Focal Length Versatility
The focal lengths of these lenses differ significantly, influencing their usability in various photography scenarios. The Canon RF 24-105mm covers a wide-angle to short telephoto range, making it suitable for landscapes, portraits, and everything in between. This versatility allows photographers to use it for multiple situations without needing to change lenses frequently. In contrast, the Sigma 18-50mm is limited to a shorter range, focusing on a more standard zoom that is ideal for everyday photography but may fall short in capturing distant subjects.
Price Comparison
The price difference between the two lenses is striking, with the Canon RF 24-105mm retailing for $1,399.00 and the Sigma 18-50mm priced at $587.00. This makes the Sigma lens about 58% less expensive, appealing to those on a tighter budget or beginners who may not want to invest heavily in camera gear. The cost-effectiveness of the Sigma lens does not compromise its optical quality, making it a viable option for many photographers.
Target Audience
Each lens targets a different audience based on their specific features and pricing. The Canon RF 24-105mm is aimed at professional photographers or serious enthusiasts who require a robust, high-performance lens that can handle various shooting conditions. Its advanced features justify the higher price point. Conversely, the Sigma 18-50mm is designed for entry-level photographers or those looking for a lightweight, versatile lens that offers excellent value without the complexities of higher-end options.
Compatibility and Usage
The Canon RF 24-105mm is specifically designed for the EOS R system, ensuring seamless integration with Canon's mirrorless cameras. This lens's features are optimized for capturing high-quality images in various settings. The Sigma 18-50mm, on the other hand, is tailored for Sony E-mount cameras, making it a great choice for Sony users looking for a compact lens. Each lens serves its respective user base well, providing compatibility that enhances the overall shooting experience.
Which should you buy?
Deciding between the Canon RF 24-105mm f/4L is USM Zoom Lens and the Sigma 18-50mm F2.8 DC DN Contemporary ultimately depends on your photography needs and budget. If you require a versatile lens with a broad focal range and professional-grade features, the Canon lens is the better option, albeit at a higher price of $1,399.00. However, if you are looking for a more affordable and compact lens that still offers superb optical quality, the Sigma lens at $587.00 could be the ideal choice for your photography adventures.

