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

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

The Canon EF 50mm f/1.8 STM Lens offers great value for budget-conscious photographers, while the RF50mm F1.8 STM Lens provides advanced features for EOS R users.

Why Canon EF is better

Price

Canon EF 50mm is cheaper by 17%

Weight

Canon EF 50mm is slightly lighter

Compatibility

Canon EF 50mm works with a wider range of cameras

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

Optics

Canon RF50mm has advanced coatings for better image quality

Design

Canon RF50mm includes a control ring for adjustments

Autofocus

Canon RF50mm offers refined autofocus for video

Overall score

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

Specifications

SpecCanon EFCanon RF50mm F1.8 STM Lens, Fixed Focal Length Prime Lens
BrandCanonCanon
Max Aperturef/1.8f/1.8
Focal Length50mm50mm
AutofocusStepping MotorGear-Type STM
Control RingNoYes
CoatingsSuper SpectraOptimized Coatings

Dimension comparison

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

Overview of the Canon EF 50mm f/1.8 STM Lens International Version

The Canon EF 50mm f/1.8 STM Lens International Version is priced at $155.99, making it a budget-friendly option for photographers looking for a versatile lens. This lens is ideal for portraits, action, and nighttime photography due to its f/1.8 maximum aperture, which provides excellent performance in low-light conditions. The lens features a minimum focusing distance of 1.15 ft. and a maximum magnification of 0.21x, allowing for detailed close-up shots. Additionally, the stepping motor enables near-silent autofocus, perfect for both video and stills.

Overview of the Canon RF50mm F1.8 STM Lens

The Canon RF50mm F1.8 STM Lens is available at a higher price of $219.00, reflecting its advanced features tailored for the EOS R series mirrorless cameras. This lens boasts a large f/1.8 aperture, making it suitable for low-light photography while also creating beautiful background blur. The RF50mm lens includes a control ring for direct setting adjustments, enhancing the user experience. With optimized lens placement and coatings, this lens excels in color balance while reducing ghosting and flare, making it a robust choice for various photographic scenarios.

Price Comparison

The Canon EF 50mm f/1.8 STM Lens is about 17% cheaper than the Canon RF50mm F1.8 STM Lens, making it an attractive option for budget-conscious photographers. While both lenses share the same focal length and maximum aperture, the price difference indicates that the EF lens is more accessible for those just starting out or looking to expand their lens collection without breaking the bank. This price gap may influence the purchasing decision for many, especially those who prioritize cost alongside performance.

Performance in Low-Light Conditions

Both lenses perform admirably in low-light conditions due to their f/1.8 maximum aperture. The Canon EF 50mm f/1.8 STM Lens excels with its Super Spectra coating, which minimizes flare and ghosting, ensuring greater contrast and color accuracy. In contrast, the Canon RF50mm F1.8 STM Lens also incorporates advanced optical features, such as PMo aspherical elements, to suppress aberrations, delivering outstanding image quality even in challenging lighting. While both lenses offer similar aperture performance, the RF lens’ advanced coatings might provide a slight edge in optical performance.

Autofocus Capabilities

The autofocus systems in both lenses are designed for smooth and quiet operation, catering to both photography and videography needs. The EF 50mm f/1.8 STM Lens uses a stepping motor for nearly silent autofocus, making it ideal for capturing candid moments without disrupting the scene. On the other hand, the RF50mm F1.8 STM Lens features a gear-type STM that enhances quiet continuous autofocus during video recording, making it a great choice for vloggers and filmmakers. While both lenses offer effective autofocus solutions, the RF lens may provide a more refined experience in video settings.

Build Quality and Design

In terms of design and build quality, the Canon RF50mm F1.8 STM Lens is optimized for the EOS R series, resulting in a more compact and lightweight structure compared to the EF lens. The RF lens includes a control ring for direct adjustments, enhancing usability during shooting. The EF 50mm f/1.8 STM Lens, while slightly bulkier, remains user-friendly with its classic design. Both lenses are designed for ease of use, but the RF lens offers a more modern touch that may appeal to contemporary photographers.

Versatility and Use Cases

Both lenses are highly versatile, catering to a wide range of photographic styles, from portraits to landscapes. The Canon EF 50mm f/1.8 STM Lens is a solid option for beginners and enthusiasts alike, providing a good balance of performance and price. The Canon RF50mm F1.8 STM Lens, however, is specifically tailored for the EOS R series, making it an excellent choice for users of those cameras who want to maximize the system's capabilities. While the EF lens is suitable for a variety of cameras, the RF lens is optimized for mirrorless technology, which may be crucial for some photographers.

Which should you buy?

When choosing between the Canon EF 50mm f/1.8 STM Lens and the Canon RF50mm F1.8 STM Lens, consider your camera system and budget. The EF lens is about 17% cheaper, making it a great value for those who are not using an EOS R series camera. However, if you own an EOS R camera, the RF lens offers tailored features that enhance performance and usability. Ultimately, the decision hinges on your specific needs and the type of photography you intend to pursue.