Canon RF75- vs lightdow EF/EF-S 420-
Updated July 2026 — Canon RF75- wins on price and accessories, lightdow EF/EF-S 420- wins on focal length and weight.
The Canon RF75-300mm lens offers superior autofocus and build quality, making it the better choice for most users, while the EF/EF-S 420-800mm lens is a budget-friendly option for those willing to work with manual focus.
Why Canon RF75- is better
Autofocus
Canon lens has advanced Eye Detection autofocus.
Build Quality
Canon lens is compact and lightweight.
Included Accessories
Canon lens includes a UV filter and cleaning kit.
Why lightdow EF/EF-S 420- is better
Price
EF/EF-S lens is significantly cheaper.
Zoom Range
EF/EF-S lens offers a longer focal length.
Compatibility
EF/EF-S lens works with a wider range of Canon DSLRs.
Overall score
Specifications
| Spec | Canon RF75- | lightdow EF/EF-S 420- |
|---|---|---|
| Autofocus | Yes | No |
| Manual Focus | No | Yes |
| Compatibility | EOS R | EF/EF-S |
| Max Aperture | F4-5.6 | F8.3 |
| Image Stabilization | No | No |
Dimension comparison
Price Comparison
The Canon RF75-300mm F4-5.6 Zoom Lens is priced at $239.00, while the EF/EF-S 420-800mm F8.3 Telephoto Zoom Lens is significantly cheaper at $67.99. This makes the latter about 71% less expensive than the Canon lens. With such a stark price difference, the EF/EF-S lens may appeal to budget-conscious photographers, especially those just starting out or those who do not require the advanced features of the Canon RF lens. However, the price disparity also raises questions about the quality and capabilities of each product, which we will explore further in this comparison.
Build Quality and Design
The Canon RF75-300mm lens boasts a compact and lightweight design, making it highly portable and easy to carry around. Weighing roughly the same as a 500ml water bottle, this lens is designed for convenience without sacrificing functionality. In contrast, the EF/EF-S 420-800mm lens, while also designed for professional use, features a fully manual focus system, which can offer more creative control but may require a steeper learning curve for some users. The build quality of the Canon lens reflects its higher price point, emphasizing durability and ease of use, whereas the EF/EF-S lens caters to photographers seeking manual control and adaptability.
Focal Length and Versatility
The Canon RF75-300mm lens offers a versatile focal length range of 75mm to 300mm, allowing for a variety of photographic styles, from portrait to wildlife photography. On the other hand, the EF/EF-S 420-800mm lens provides an even broader range, reaching up to 800mm, making it ideal for capturing distant subjects such as wildlife or sports events. This extended range makes the EF/EF-S lens particularly appealing for those specializing in telephoto photography. However, the manual focus requirement of the EF/EF-S model could limit versatility for some users compared to the autofocus capabilities of the Canon lens.
Autofocus and Usability
The Canon RF75-300mm lens includes advanced features such as Eye Detection autofocus, which is particularly beneficial for portrait photography, enabling the camera to focus on a subject's eyes even at longer distances. This feature enhances usability, especially for those who frequently shoot moving subjects. Conversely, the EF/EF-S 420-800mm lens operates entirely on manual focus, which can be a double-edged sword. While it allows for greater control, it also demands a higher level of skill and patience, making it less user-friendly for beginners or those who prefer quick adjustments.
Compatibility
When it comes to compatibility, the Canon RF75-300mm lens is specifically designed for Canon EOS R series cameras, such as the R100, R50, and R5. This narrow compatibility might limit its appeal to users with older Canon DSLR models. In contrast, the EF/EF-S 420-800mm lens is compatible with a broader range of Canon DSLR cameras, including the Rebel series and the 5D Mark IV, making it a more versatile option for users with different camera bodies. This wide compatibility positions the EF/EF-S lens as a more accessible choice for photographers with existing Canon equipment.
Included Accessories
The Canon RF75-300mm lens comes as a complete package, including a UV filter, lens cap keeper, and a cleaning kit, which adds value to its higher price. This inclusion is particularly beneficial for photographers looking to protect their investment and maintain their gear in optimal condition. The EF/EF-S 420-800mm lens does not appear to come with additional accessories, which may be a consideration for users wanting a more comprehensive package. While the Canon lens's extras justify its cost, the absence of similar accessories with the EF/EF-S lens could be a drawback for some.
Performance in the Field
Field performance is a crucial aspect of any lens, and the Canon RF75-300mm lens excels with its Eye Detection autofocus, making it easier to capture sharp images of moving subjects. The manual focus design of the EF/EF-S 420-800mm lens allows for greater precision but requires more time and practice to achieve optimal results. Consequently, photographers who value speed and convenience may prefer the Canon lens, while those who appreciate the artistry of manual focusing might lean towards the EF/EF-S model. The practical performance differences between these lenses will largely depend on the user's photography style and experience level.
Which should you buy?
In conclusion, the choice between the Canon RF75-300mm F4-5.6 Zoom Lens and the EF/EF-S 420-800mm F8.3 Telephoto Zoom Lens hinges on your specific needs and budget. The Canon lens, priced at $239.00, offers superior autofocus capabilities, a compact design, and extra accessories, making it ideal for users who prioritize ease of use and convenience. Conversely, the EF/EF-S lens is significantly cheaper at $67.99, providing a more extensive zoom range but requiring manual focusing, which could deter some photographers. Ultimately, if you're looking for a versatile, user-friendly lens, the Canon RF75-300mm is the better investment, while the EF/EF-S 420-800mm lens is a great budget option for those willing to embrace the challenge of manual photography.

