Both lenses give you a constant f/2.8 aperture, so the real question is reach versus compactness. The RF 24-70mm f/2.8 L IS USM is the established, easier-to-carry standard zoom, while the RF 24-105mm f/2.8 L IS USM Z adds more length at the long end for people who want to avoid lens changes. Confirm exact specs, including what the Z in the name means, on Canon’s product page.
What Each Lens Offers
The 24-70mm is the classic professional standard zoom. Its range covers wide interiors, groups, portraits and general event work, and the f/2.8 aperture holds steady as you zoom. Many working photographers treat it as a default lens because it handles most situations without much thought.
The 24-105mm f/2.8 keeps the same aperture but extends to 105mm. That extra 35mm at the long end is useful for portraits with more compressed backgrounds, tighter shots across a venue and details at a distance. Longer zoom ranges with a fast constant aperture usually mean a larger, heavier lens, so check the size and weight listed by Canon before you decide.
Side by Side
| Trait | RF 24-70mm f/2.8 | RF 24-105mm f/2.8 Z |
|---|---|---|
| Wide end | 24mm | 24mm |
| Long end | 70mm | 105mm |
| Constant aperture | f/2.8 | f/2.8 |
| Carry and balance | More compact | Longer, likely heavier |
| Strength | Everyday flexibility | Extra reach without a swap |
How to Choose
- List the lenses you carry now. If you often add a 70-200mm just for a few frames beyond 70mm, the longer zoom could replace that step.
- Think about your subjects. Event, wedding and documentary shooters often benefit from the extra reach, while travel and street shooters may prefer the smaller lens.
- Consider handling. A longer, heavier lens on a small mirrorless body changes balance, and long days add up.
- Consider video. A constant aperture with a longer range gives flexible framing from one position.
- Check compatibility with your accessories, such as filters and gimbals, on Canon’s page.
General Baselines for Both
These are general guidelines, not rules. For portraits, an aperture around f/2.8 to f/4 separates the subject from the background. At 105mm, a shutter speed of roughly 1/125 and faster is a sensible floor for handheld shots of still subjects, and 1/250 or faster for people who move. For group photos, close to f/5.6 helps keep every face sharp.
FAQ
Does the longer lens replace a 70-200mm?
Only partly. It covers the lower end of that range, but a dedicated 70-200mm reaches farther at 200mm and is built for longer subjects.
Is the 24-70mm still worth considering?
Yes. If you rarely need more than 70mm, the shorter zoom is usually easier to carry and keep balanced on the camera.
The Short Version
The 24-70mm f/2.8 is the compact, proven choice, and the 24-105mm f/2.8 Z is the reach-focused option for fewer lens changes. Choose the 24-70 for light carry and the 24-105 when the extra 35mm saves you from swapping lenses.
