Canon RF 100-300mm f/2.8 L IS USM vs Canon RF 28-70mm f/2 L USM
The bottom line
These cover different focal lengths — the Canon RF 100-300mm f/2.8 L IS USM is 100-300mm, the Canon RF 28-70mm f/2 L USM is 28-70mm — so they're not really substitutes. Pick by the field of view you actually need: the Canon RF 100-300mm f/2.8 L IS USM for super-telephoto, the Canon RF 28-70mm f/2 L USM for standard zoom.
Choose the Canon RF 100-300mm f/2.8 L IS USM if…
- ✓You need more reach — it goes to 300mm vs 70mm for distant subjects, wildlife and sport.
- ✓You shoot handheld or on an unstabilised body — it has optical stabilisation, the other doesn't.
Choose the Canon RF 28-70mm f/2 L USM if…
- ✓You want more light and background blur — f/2 is faster than f/2.8, better for low light and subject separation.
- ✓You shoot wide — it starts at 28mm vs 100mm for landscapes, interiors and architecture.
- ✓You're on a budget — $3,099 vs $9,499 leaves more for other gear.
- ✓You value portability — at 1430g (3.15 lb) it's lighter than the 2590g (5.71 lb) alternative for travel and all-day carry.
Where they differ
- ›Aperture: the Canon RF 28-70mm f/2 L USM opens to f/2 vs the Canon RF 100-300mm f/2.8 L IS USM's f/2.8 — more light and shallower depth-of-field.
- ›Focal range: Canon RF 100-300mm f/2.8 L IS USM is 100-300mm, Canon RF 28-70mm f/2 L USM is 28-70mm — different framing and reach.
- ›Price: the Canon RF 28-70mm f/2 L USM is $3,099, $6,400 under the Canon RF 100-300mm f/2.8 L IS USM.
- ›Stabilisation: only the Canon RF 100-300mm f/2.8 L IS USM has optical stabilisation — steadier handheld shots, especially on bodies without IBIS.
- ›Weight: the Canon RF 28-70mm f/2 L USM is 1430g (3.15 lb) vs 2590g (5.71 lb) — you'll feel the difference handheld.
Frequently asked
Is the Canon RF 100-300mm f/2.8 L IS USM or the Canon RF 28-70mm f/2 L USM better?
These cover different focal lengths — the Canon RF 100-300mm f/2.8 L IS USM is 100-300mm, the Canon RF 28-70mm f/2 L USM is 28-70mm — so they're not really substitutes. Pick by the field of view you actually need: the Canon RF 100-300mm f/2.8 L IS USM for super-telephoto, the Canon RF 28-70mm f/2 L USM for standard zoom.
Who should choose the Canon RF 100-300mm f/2.8 L IS USM?
Choose the Canon RF 100-300mm f/2.8 L IS USM if you need more reach — it goes to 300mm vs 70mm for distant subjects, wildlife and sport. Choose it if you shoot handheld or on an unstabilised body — it has optical stabilisation, the other doesn't.
Who should choose the Canon RF 28-70mm f/2 L USM?
Choose the Canon RF 28-70mm f/2 L USM if you want more light and background blur — f/2 is faster than f/2.8, better for low light and subject separation. Choose it if you shoot wide — it starts at 28mm vs 100mm for landscapes, interiors and architecture. Choose it if you're on a budget — $3,099 vs $9,499 leaves more for other gear. Choose it if you value portability — at 1430g (3.15 lb) it's lighter than the 2590g (5.71 lb) alternative for travel and all-day carry.
What is the main difference between the Canon RF 100-300mm f/2.8 L IS USM and the Canon RF 28-70mm f/2 L USM?
Aperture: the Canon RF 28-70mm f/2 L USM opens to f/2 vs the Canon RF 100-300mm f/2.8 L IS USM's f/2.8 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 100-300mm | 28-70mm |
| Lens Type | Zoom | Zoom |
| Optical Elements | 23 | 19 |
| Optical Groups | 18 | 13 |
| Aperture & Iris | ||
| Maximum Aperture | f/2.8 | f/2 |
| Minimum Aperture | f/32 | f/22 |
| Aperture Blades | 11 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | Canon RF | Canon RF |
| Angle of View | 24° – 8° | 75° – 34° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | Dual Nano USM | Ring USM |
| Focus Limiter | Yes | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 180 cm | 39 cm |
| Max Magnification | 0.16x | 0.18x |
| Stabilization & Video | ||
| Optical Stabilization | Yes | No |
| Aperture Ring | No | No |
| Declickable Aperture | No | No |
| Parfocal | No | No |
| Internal Zoom | Yes | Yes |
| General | ||
| Price (MSRP) | $9,499 | $3,099 |
| Filter Size | 112mm | 95mm |
| Diameter | 128mm | 103.8mm |
| Length | 329.9mm | 139.8mm |
| Weight | 2590g (5.71 lb) | 1430g (3.15 lb) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | Yes | No |
