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Canon RF100- vs Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens

Updated July 2026 — Canon RF100- wins on zoom and weight, Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens wins on price and size.

The Canon RF100-400mm F5.6-8 IS USM excels in versatility and zoom capabilities, while the RF50mm F1.8 STM Lens offers affordability and low-light performance.

Why Canon RF100- is better

Zoom Range

100-400mm zoom range for versatile shooting

Image Stabilization

Up to 6 stops of shake correction

Autofocus

Fast and quiet Nano USM technology

Why Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens is better

Price

$219.00 is significantly cheaper

Portability

Compact and lightweight design

Low-Light Performance

Large f/1.8 aperture for better low-light shots

Overall score

Canon RF100-
85
Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens
75

Specifications

SpecCanon RF100-Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens
Focal Length100-400mm50mm
ApertureF5.6-8F1.8
Image StabilizationYesNo
Autofocus TypeNano USMStepping Motor
Minimum Focus2.89ft0.44ft

Dimension comparison

Canon RF100-Canon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens

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 for wildlife, sports, and travel photography. Priced at $699.00, it offers a significant zoom range of 100-400mm, allowing photographers to capture distant subjects with ease. This lens features an Optical Image Stabilizer that provides up to 5.5 stops of shake correction, enhancing image stability. When paired with an EOS R series camera featuring In-Body Image Stabilization, this can increase to six stops. With a minimum focusing distance of 2.89 feet at 200mm and a maximum magnification of 0.41x at 400mm, it excels in various photographic scenarios.

Overview of the Canon RF50mm F1.8 STM Lens

The Canon RF50mm F1.8 STM Lens is a compact and lightweight prime lens priced at $219.00. This lens is ideal for a variety of photographic styles, from portraits to landscapes. With a large f/1.8 aperture, it excels in low-light conditions and provides beautiful background blur. The lens features a Stepping Motor for smooth and quiet autofocus, making it suitable for both photography and video recording. Additionally, its optimized lens placement and coatings help deliver excellent color balance while minimizing ghosting and flare, ensuring stunning image quality across different shooting environments.

Price Comparison

When it comes to pricing, the Canon RF50mm F1.8 STM Lens is significantly more affordable, costing $219.00, which is about 69% less than the Canon RF100-400mm F5.6-8 IS USM at $699.00. This substantial price difference makes the 50mm lens an attractive option for budget-conscious photographers who still want high-quality optics. While the RF100-400mm offers extensive zoom capabilities, the lower price of the RF50mm makes it a practical choice for casual shooters and professionals alike, especially when versatility and affordability are key considerations.

Image Quality

The RF100-400mm F5.6-8 IS USM is designed to deliver high-image quality with its Ultra Low Dispersion lens element, which corrects chromatic aberration throughout its zoom range. This feature ensures that images are crisp and colorful, minimizing color blur across various focal lengths. In contrast, the RF50mm F1.8 STM Lens focuses on outstanding optical performance at a fixed focal length. With its aspherical lens elements and large aperture, this lens excels in low-light situations and produces pleasing bokeh. Both lenses feature excellent image quality, but they cater to different photographic needs—zoom versatility versus low-light performance.

Autofocus Performance

Autofocus is a critical aspect of modern photography, and both lenses offer impressive performance. The RF100-400mm is equipped with Canon's Nano USM technology, providing fast, smooth, and quiet autofocus, which is particularly beneficial for wildlife and sports photography where speed is essential. The RF50mm F1.8 STM Lens features a Stepping Motor that allows for smooth and quiet continuous autofocus, making it well-suited for video recording and still photography alike. While both lenses excel in autofocus, the RF100-400mm's advanced technology may offer an edge in dynamic shooting situations.

Versatility and Use Cases

The Canon RF100-400mm F5.6-8 IS USM is ideal for photographers looking for versatility in focal lengths. Its expansive zoom range allows it to be used effectively for wildlife, sports, and travel photography, making it a multi-functional tool for various scenarios. On the other hand, the RF50mm F1.8 STM Lens shines in portrait and street photography, thanks to its fixed focal length and large aperture. Photographers can capture stunning images in diverse environments, but they may need to adjust their positioning more frequently with the prime lens. Depending on the intended use, each lens provides unique advantages.

Build and Portability

When discussing build and portability, the RF50mm F1.8 STM Lens stands out due to its compact and lightweight design, making it easy to carry for everyday shooting. It’s a lens that photographers can keep attached to their EOS R series camera without adding significant weight. Conversely, the RF100-400mm, while still relatively lightweight for a telephoto lens, is bulkier due to its zoom capabilities. It may require additional consideration when packing for trips or long shooting sessions. Thus, if portability is a priority, the RF50mm may be the better choice.

Which should you buy?

Choosing between the Canon RF100-400mm F5.6-8 IS USM and the Canon RF50mm F1.8 STM Lens ultimately depends on your photography style and needs. If you require a versatile telephoto lens for wildlife or sports photography, the RF100-400mm is worth the investment, despite its higher price of $699.00. However, if you are looking for a budget-friendly option that delivers excellent low-light performance and portability, the RF50mm at $219.00 is an outstanding choice. Each lens serves different purposes; your decision should align with your specific photographic goals.