The Canon 50mm f/1.8 STM comes in two mounts: RF for Canon mirrorless cameras and EF for Canon DSLRs. The right choice mostly depends on your camera, because the two share the same focal length and maximum aperture and differ mainly in the mount they are built for.
What Each Lens Is For
The nifty fifty is a small, light prime with a bright f/1.8 aperture. It suits casual portraits, indoor shots, food, and everyday walking around. It is a common first prime because it adds background blur and low-light ability that kit zooms do not offer.
Key Differences
- Mount: The RF version attaches directly to Canon RF mirrorless bodies. The EF version attaches directly to EF and EF-S DSLRs.
- Adapting: The EF lens can be used on RF bodies with Canon’s EF to RF adapter, but that adds length and a part to carry. The RF lens cannot be used on DSLRs.
- Size: The adapted EF setup is longer than the native RF lens. Check the maker’s pages for dimensions.
- Design generation: The RF lens is the newer design and may include features aimed at mirrorless handling, such as a control ring on some RF lenses. Confirm details for this model.
- Crop sensors: On APS-C bodies, a fifty acts like a longer lens, which many people like for portraits.
How to Choose
- Look at your camera mount. RF mirrorless means RF lens; EF or EF-S DSLR means EF lens.
- If you own a DSLR now but plan to move to mirrorless, think about whether the EF lens plus adapter is enough for you.
- If you only shoot mirrorless, a native lens is usually simpler.
- Compare current availability, as stock and used options change over time.
- Check the filter size, so any existing filters still fit.
Quick Comparison
| Trait | RF version | EF version |
|---|---|---|
| Camera type | Canon mirrorless | Canon DSLR |
| Adapter needed | No, on RF bodies | Yes, on RF bodies |
| Focal length | 50mm | 50mm |
| Maximum aperture | f/1.8 | f/1.8 |
Settings to Try
As general baselines, try f/2 to f/2.8 for portraits when you want the eyes sharp, f/1.8 for dim rooms, and f/5.6 to f/8 for sharper landscapes or group shots. Keep your shutter speed at roughly 1/100 or faster for handheld work, and raise ISO before you let shutter speed drop too low. These are only baseline values, so adjust to your light and subject.
FAQ
Can I use the EF 50mm f/1.8 on a mirrorless Canon?
Yes, with the maker’s adapter. Autofocus and electronic control are designed to carry across.
Why choose a 50mm f/1.8 at all?
It is small, light, and gathers much more light than a typical kit zoom. It is a useful way to learn prime-lens shooting.
The Short Version
Choose the RF version if you shoot Canon mirrorless, and the EF version if you shoot a Canon DSLR. Keep in mind that the EF lens can be adapted, while the RF lens cannot go on a DSLR. Verify specs on the maker’s page.
