Canon RF28- vs SIRUI
Updated July 2026 — full head-to-head comparison.
Overview of the Canon RF28-70mm F2.8 IS STM
The Canon RF28-70mm F2.8 IS STM lens is priced at $1,098.95, offering a versatile mid-range zoom with a constant f/2.8 aperture throughout its zoom range. This lens is engineered for both photography and videography, making it an excellent choice for creators who need high-quality optics without the bulk. Its compact and lightweight design, coupled with advanced image stabilization technology, positions it as an everyday carry lens for both amateurs and professionals.
Overview of the SIRUI 20mm T1.8 Anamorphic Lens
The SIRUI 20mm T1.8 Anamorphic Lens is significantly more affordable, retailing at $599.00, making it about 45% cheaper than the Canon RF28-70mm lens. This lens is specifically designed for cinematic applications and features a unique 1.33x squeeze factor, which allows filmmakers to achieve a stunning 2.35:1 widescreen aspect ratio. Its capabilities, including selectable manual and autofocus, make it an appealing option for videographers looking to enhance their production quality without overspending.
Image Quality and Performance
When it comes to image quality, the Canon RF28-70mm excels with its edge-to-edge clarity, thanks to its two UD elements and two aspheric lenses that minimize chromatic aberration. This lens is particularly effective in low-light conditions, allowing photographers to take advantage of the fast f/2.8 aperture for creative depth-of-field effects. In contrast, the SIRUI 20mm T1.8 provides a wide T1.8 aperture that enhances low-light performance and offers exceptional depth of field control. While both lenses promise impressive image quality, the Canon lens is better suited for still photography, while the SIRUI lens shines in cinematic contexts.
Build Quality and Durability
The Canon RF28-70mm is built with durability in mind, featuring weather-resistant construction that meets the standards of L-series lenses. This makes it a robust choice for outdoor shooting in challenging environments. On the other hand, the SIRUI 20mm T1.8 is compact and lightweight at only 480 grams, which makes it ideal for handheld shooting, gimbals, and run-and-gun scenarios. While both lenses are designed for different uses, the Canon lens offers superior durability, whereas the SIRUI lens prioritizes portability.
Autofocus and Usability
The SIRUI 20mm T1.8 boasts a precision STM stepping motor that provides smooth, accurate, and quiet autofocus, making it suitable for video applications. Its eye-tracking capabilities and AF/MF switch offer filmmakers creative control over their shots. In contrast, the Canon RF28-70mm's autofocus features are not detailed in the provided data, but its design is geared toward versatility in both photography and videography. While both lenses cater to different user needs, the SIRUI lens appears to be more tailored for video creators, while the Canon lens is perfect for general use.
Price Comparison
The price difference between the two lenses is substantial, with the SIRUI 20mm T1.8 at $599.00 and the Canon RF28-70mm at $1,098.95. This results in a price gap of approximately $499.95, making the SIRUI lens about 45% more affordable. For those on a tighter budget or just starting in videography, the SIRUI offers great value without compromising on essential features. Conversely, for those who prioritize versatility in photography and require a reliable all-in-one lens, the Canon RF28-70mm may justify the higher price.
Target Audience
The Canon RF28-70mm appeals to a broad range of users, from amateur photographers to seasoned professionals looking for a high-quality, versatile lens. Its mid-range zoom capabilities and high image quality make it ideal for various shooting scenarios, including events, portraits, and landscapes. The SIRUI 20mm T1.8, however, specifically targets filmmakers and videographers who need a purpose-built lens for cinematic storytelling. Its features are designed to enhance film production, making it less suited for general photography.
Which should you buy?
In conclusion, the choice between the Canon RF28-70mm F2.8 IS STM and the SIRUI 20mm T1.8 Anamorphic Lens ultimately depends on your specific needs. If you are primarily a photographer seeking a versatile lens for various situations, the Canon lens is a worthy investment despite its higher price. However, if you are a videographer looking for a cost-effective solution that delivers cinematic quality, the SIRUI lens offers excellent features at a more accessible price point.

