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Canon RF100- vs Canon RF28-

Updated July 2026 — Canon RF100- wins on price and zoom range, Canon RF28- wins on aperture and build quality.

The Canon RF100-400mm F5.6-8 IS USM is a more budget-friendly option for telephoto needs, while the RF28-70mm F2.8 IS STM excels in versatility and low-light performance.

Why Canon RF100- is better

Price

RF100-400mm is $699.00, cheaper than RF28-70mm at $1,098.95.

Zoom Range

RF100-400mm offers a significant zoom range of 100-400mm.

Lightweight

RF100-400mm is compact and lightweight for travel.

Why Canon RF28- is better

Aperture

RF28-70mm has a constant f/2.8 aperture for low light.

Image Quality

RF28-70mm provides edge-to-edge sharpness with advanced optics.

Weather Resistance

RF28-70mm has a durable, weather-resistant construction.

Overall score

Canon RF100-
85
Canon RF28-
90

Specifications

SpecCanon RF100-Canon RF28-
Focal Length100-400mm28-70mm
Max Aperturef/5.6-8f/2.8
Image Stabilization5.5 stopsadvanced
AutofocusNano USMreliable
Minimum Focus2.89 ftnot specified

Dimension comparison

Canon RF100-Canon RF28-

Overview of the Canon RF100-400mm F5.6-8 IS USM

The Canon RF100-400mm F5.6-8 IS USM is a versatile telephoto lens designed primarily for wildlife and sports photography. Priced at $699.00, this lens offers a significant zoom range, making it ideal for capturing distant subjects. Its compact and lightweight design also contributes to its portability, allowing photographers to take it along on various adventures. The lens features an Optical Image Stabilizer that provides up to 5.5 stops of shake correction, enhancing image clarity even in challenging shooting conditions.

The RF100-400mm lens has a minimum focusing distance of 2.89 feet at 200mm and a maximum magnification of 0.41x at 400mm, making it suitable for detailed close-up shots as well. With Canon’s Nano USM technology, it also boasts fast and quiet autofocus, ensuring that you can capture fleeting moments without disturbing the scene.

Overview of the Canon RF28-70mm F2.8 IS STM

The Canon RF28-70mm F2.8 IS STM lens stands out with its constant f/2.8 aperture throughout the zoom range, providing exceptional low-light performance. Priced at $1,098.95, this lens is aimed at both still and video content creators who seek high-quality imagery without the bulk of traditional lenses. Weighing just over one pound, it is designed for everyday use, making it a great option for photographers on the go.

Incorporating advanced image stabilization technology, the RF28-70mm lens allows for a smaller and lighter build while maintaining outstanding image quality. It features two UD elements and two aspheric lenses to minimize chromatic aberration, ensuring sharpness across the frame. The weather-resistant construction also adds to its appeal, making it suitable for various shooting environments.

Price Comparison: RF100-400mm vs RF28-70mm

In terms of pricing, the Canon RF100-400mm F5.6-8 IS USM is about 36% cheaper than the RF28-70mm F2.8 IS STM. At $699.00, the RF100-400mm provides a more budget-friendly option for photographers who require a telephoto lens for specific applications like wildlife photography. Conversely, the RF28-70mm, priced at $1,098.95, reflects its premium features, particularly its constant f/2.8 aperture and compact design.

This difference in price may attract different segments of photographers. Those who prioritize reaching distant subjects might find the RF100-400mm to be a more sensible investment, while those who often shoot in variable lighting conditions or require versatility may lean towards the RF28-70mm despite its higher cost.

Target Audience and Use Cases

The Canon RF100-400mm F5.6-8 IS USM is primarily suited for wildlife and sports photographers who need to capture fast-moving subjects from a distance. Its significant zoom range allows users to get close to their subjects without physically moving, making it perfect for scenarios like birdwatching or sporting events.

On the other hand, the RF28-70mm F2.8 IS STM caters to a broader audience, including portrait, landscape, and event photographers. Its fast aperture allows for creative shooting in low-light conditions and provides beautiful background blur, making it an excellent choice for portraiture as well. Given its versatility, it can serve as an everyday lens for various photographic pursuits.

Image Quality and Stabilization

Image quality is a critical consideration for any lens, and both the RF100-400mm and RF28-70mm deliver impressive results. The RF100-400mm features a single Ultra Low Dispersion lens element that corrects chromatic aberration, ensuring that images are crisp and vibrant throughout the zoom range. With up to 6 stops of stabilization when paired with EOS R series cameras, it offers excellent performance even in less-than-ideal conditions.

Meanwhile, the RF28-70mm lens boasts an edge-to-edge sharpness thanks to its two UD elements and two aspheric lenses, minimizing chromatic aberration effectively. The lens's newly designed stabilization unit allows for a lighter build without compromising image quality. Both lenses excel in their respective domains, providing high-quality images for different types of photography.

Autofocus Performance

The autofocus performance of the two lenses reflects their intended uses. The RF100-400mm features Canon’s Nano USM technology, which enables fast, smooth, and quiet autofocus, essential for capturing wildlife and sporting events where timing is crucial. This lens's ability to focus quickly and accurately can make a significant difference when photographing dynamic subjects.

In contrast, the RF28-70mm also features reliable autofocus, designed to meet the needs of both still and video creators. While it may not have the same high-speed capabilities as the RF100-400mm, its autofocus is more than adequate for general photography and videos, providing a seamless experience without distracting noise.

Weight and Portability

Portability is a vital factor for photographers who often travel or shoot on location. The RF100-400mm weighs in as a compact and lightweight option, making it easy to carry during extended shooting sessions. Its design is similar in size to the EF 70-300mm lens, which adds to its travel-friendly nature.

In contrast, the RF28-70mm, while still light compared to many lenses, is designed for versatility and ease of use as an everyday lens. Weighing just over one pound, it strikes a balance between portability and performance, making it suitable for various shooting environments without being too cumbersome.

Which should you buy?

Choosing between the Canon RF100-400mm F5.6-8 IS USM and the RF28-70mm F2.8 IS STM ultimately depends on your specific photographic needs. If your focus is on capturing distant subjects, such as wildlife or sports, the RF100-400mm offers a more economical solution with excellent image stabilization and zoom capabilities. On the other hand, if you often find yourself shooting in low light or need a versatile lens for various photography styles, the RF28-70mm is worth the investment for its constant aperture and superior edge-to-edge sharpness. Both lenses excel in their intended domains, making either a solid choice depending on your photography goals.