Canon RF-S 10-18mm vs EF-S 10-18mm: Which Ultra Wide Should You Buy?
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The quick answer
The RF-S 10-18mm is my winner for RF-mount cameras. It offers better portability, modern features, and improved sharpness.
The RF-S 10-18mm is the stronger choice if you prioritize those advantages. The EF-S 10-18mm remains a solid performer, especially if you are upgrading gradually to an RF system.
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Size, build, and everyday controls
When it comes to finding the perfect ultrawide lens for your crop-sensor RF-mount cameras like the Canon R50, R100, R10, and R7, the choice often boils down to two contenders: the newer RFS 10-18mm f/4.5-6.3 and the older EFS 10-18mm f/4.5-5.6 (with an adapter).
| Feature | RF-S 10-18mm / EF-S 10-18mm |
|---|---|
| Size & Portability |
RF-S 10-18mm: Compact and lightweight at just 5.3 oz and slightly over 2 inches when retracted. EF-S 10-18mm: Bulkier at 8.5 oz (with the RF adapter) and nearly 4 inches long. |
| Build Quality |
RF-S: Prioritizes portability with a plastic build; great for on-the-go photography. EF-S: More robust but heavier, thanks to its larger form factor. |
| Convenience |
RF-S: Requires unlocking before use, reducing storage size. EF-S: Includes physical switches for autofocus/manual focus and stabilization, offering quick adjustments. |
Aperture, stabilization, and close focus
| Feature | RF-S 10-18mm / EF-S 10-18mm |
|---|---|
| Aperture Range |
RF-S: f/4.5-6.3; slightly slower at 18mm, but not a significant drawback. EF-S: f/4.5-5.6; offers better low-light performance at the telephoto end. |
| Autofocus | Both feature STM motors for smooth, silent focusing, but the RF-S edges ahead in speed. |
| Image Stabilization | Both provide up to 4 stops of stabilization, perfect for handheld shots and video. |
| Filter Thread Size |
RF-S: 49mm. EF-S: 67mm. |
| Macro Abilities |
RF-S: Exceptional close focus; subjects can be as close as the glass element. EF-S: Impressive but not as extreme as the RFS. |
Sharpness, vignetting, and flare
Sharpness
RF-S:
- Center: Sharp wide open; stopping down doesn’t improve much.
- Corners: Sharpen up by f/8 but soften at f/11.
EF-S:
- Center: Sharp wide open; peaks at f/8.
- Corners: Softer and more distorted, especially when stopped down.
Vignetting
- RF-S: Slightly more pronounced but easily correctable in post.
- EF-S: Minimal and less noticeable.
Flaring
- Both lenses handle flaring moderately well, with the RF-S showing slight improvements over the EF-S.
Which ultra-wide I would choose
Choose the RF-S 10-18mm if:
- You prioritize portability and don’t want to bother with an adapter.
- Close-focus capability is a must for your creative needs.
- You’re buying new for an RF-mount camera.
Stick with the EF-S 10-18mm if:
- You already own it and don’t need extreme close-focus or lighter weight.
The RFS 10-18mm emerges as the winner for RF-mount cameras, offering better portability, modern features, and improved sharpness. However, the EFS 10-18mm remains a solid performer, especially for those upgrading gradually to RF systems.