Canon EF vs Canon RF
Updated July 2026 — Canon RF leads on price and autofocus.
The Canon EF 50mm f/1.8 STM Lens offers great value for budget-conscious photographers, while the RF version provides enhanced compatibility and performance for EOS R-Series users.
Why Canon EF is better
Price
EF lens is $63.01 cheaper
Weight
EF lens is slightly lighter
Compatibility
Works with a wider range of Canon DSLRs
Why Canon RF is better
Optical Design
RF lens features modern optical design
Autofocus
RF lens has improved autofocus performance
Mount Type
RF lens is designed for newer camera systems
Overall score
Specifications
| Spec | Canon EF | Canon RF |
|---|---|---|
| Aperture | f/1.8 | f/1.8 |
| Focal Length | 50mm | 50mm |
| Motor Type | STM | STM |
| Coating | Super Spectra | Super Spectra |
| Mount Type | EF | RF |
Dimension comparison
Overview of the Canon EF 50mm f/1.8 STM Lens
The Canon EF 50mm f/1.8 STM Lens International Version is priced at $155.99. This lens is compact and designed for everyday photography, making it an excellent choice for those seeking a versatile option. With a maximum aperture of f/1.8, it performs well in low-light conditions and allows for beautiful background blur, enhancing portrait photography. Its STM motor ensures quick and nearly silent autofocus, catering to both stills and video work.
Overview of the Canon RF 50mm F1.8 STM Lens
The Canon RF 50mm F1.8 STM Lens comes with a price tag of $219.00, making it about 40% more expensive than the EF version. This lens is specifically designed for EOS R-Series cameras and offers a wide f/1.8 aperture, similarly excelling in low-light environments. The RF lens features an aspheric lens element, which helps in achieving sharp images and beautiful bokeh, making it a solid option for creative photography.
Design and Build Quality
The design of the EF 50mm f/1.8 STM Lens emphasizes compactness and portability, which is ideal for everyday shooting. Weighing in at a manageable size, it’s easy to carry around for various photography needs. On the other hand, the RF 50mm F1.8 STM Lens is also lightweight but is designed with the RF mount, which may provide additional advantages in terms of compatibility and performance with newer Canon cameras. Both lenses feature a durable build, but the RF lens may offer a slightly more modern aesthetic that complements newer camera bodies.
Autofocus Performance
Autofocus is a critical aspect for photographers, and both lenses excel in this area. The EF 50mm f/1.8 STM Lens utilizes a stepping motor (STM) that provides near-silent and smooth autofocus, making it suitable for video recording and quiet shooting environments. The RF 50mm F1.8 STM Lens also features an STM motor, ensuring fast and nearly silent autofocus performance. Both lenses promise quick focusing, but the RF lens might slightly outperform in the context of the latest Canon camera systems.
Image Quality and Optical Performance
In terms of image quality, both lenses are designed to deliver sharp images with excellent contrast. The EF 50mm f/1.8 STM Lens features Super Spectra coatings on its elements, which help minimize flare and ghosting, particularly in difficult lighting conditions. Similarly, the RF 50mm F1.8 STM Lens incorporates Super Spectra Coating, ensuring accurate color reproduction and contrast. While both lenses promise high image quality, the RF lens may have a technological edge due to its use of modern optical design techniques.
Price Comparison
The EF 50mm f/1.8 STM Lens is priced at $155.99, while the RF 50mm F1.8 STM Lens is priced at $219.00. This translates to a price difference of $63.01, making the EF lens about 29% cheaper than its RF counterpart. For photographers on a budget, the EF version offers a compelling value without sacrificing essential features. However, those invested in the EOS R-Series system may find the higher price of the RF lens justified by its compatibility and performance enhancements.
Compatibility and Mount Type
Compatibility is an important consideration when choosing a lens. The EF 50mm f/1.8 STM Lens is designed for Canon's EF mount, making it compatible with a wide range of Canon DSLR cameras. In contrast, the RF 50mm F1.8 STM Lens is specifically built for Canon's RF mount, catering primarily to the EOS R-Series cameras. For users already engaged in the RF ecosystem, the RF lens is the clear choice, while the EF lens remains a versatile option for those with older Canon systems.
Which should you buy?
Deciding between the Canon EF 50mm f/1.8 STM Lens and the Canon RF 50mm F1.8 STM Lens ultimately depends on your specific needs and camera system. If you are looking for a more economical option with excellent performance, the EF lens at $155.99 is the better choice, especially for those using Canon DSLRs. However, if you own an EOS R-Series camera and prioritize compatibility along with modern features, the RF lens at $219.00 offers enhanced performance that justifies its higher price.