Canon RF 135mm f/1.8 L IS USM vs Canon RF 5.2mm f/2.8 L Dual Fisheye
The bottom line
These cover different focal lengths — the Canon RF 135mm f/1.8 L IS USM is 135mm, the Canon RF 5.2mm f/2.8 L Dual Fisheye is 5mm — so they're not really substitutes. Pick by the field of view you actually need: the Canon RF 135mm f/1.8 L IS USM for zoom, the Canon RF 5.2mm f/2.8 L Dual Fisheye for wide-angle.
Choose the Canon RF 135mm f/1.8 L IS USM if…
- ✓You want more light and background blur — f/1.8 is faster than f/2.8, better for low light and subject separation.
- ✓You need more reach — it goes to 135mm vs 5mm for distant subjects, wildlife and sport.
- ✓You shoot handheld or on an unstabilised body — it has optical stabilisation, the other doesn't.
- ✓You like close-focus work — 0.26x magnification vs 0.03x.
Choose the Canon RF 5.2mm f/2.8 L Dual Fisheye if…
- ✓You shoot wide — it starts at 5mm vs 135mm for landscapes, interiors and architecture.
- ✓You value portability — at 395g (13.9 oz) it's lighter than the 935g (2.06 lb) alternative for travel and all-day carry.
Where they differ
- ›Aperture: the Canon RF 135mm f/1.8 L IS USM opens to f/1.8 vs the Canon RF 5.2mm f/2.8 L Dual Fisheye's f/2.8 — more light and shallower depth-of-field.
- ›Focal range: Canon RF 135mm f/1.8 L IS USM is 135mm, Canon RF 5.2mm f/2.8 L Dual Fisheye is 5mm — different framing and reach.
- ›Price: the Canon RF 5.2mm f/2.8 L Dual Fisheye is $2,099, $100 under the Canon RF 135mm f/1.8 L IS USM.
- ›Stabilisation: only the Canon RF 135mm f/1.8 L IS USM has optical stabilisation — steadier handheld shots, especially on bodies without IBIS.
- ›Close-up: the Canon RF 135mm f/1.8 L IS USM reaches 0.26x magnification vs 0.03x — more for close-up and macro work.
- ›Weight: the Canon RF 5.2mm f/2.8 L Dual Fisheye is 395g (13.9 oz) vs 935g (2.06 lb) — you'll feel the difference handheld.
Frequently asked
Is the Canon RF 135mm f/1.8 L IS USM or the Canon RF 5.2mm f/2.8 L Dual Fisheye better?
These cover different focal lengths — the Canon RF 135mm f/1.8 L IS USM is 135mm, the Canon RF 5.2mm f/2.8 L Dual Fisheye is 5mm — so they're not really substitutes. Pick by the field of view you actually need: the Canon RF 135mm f/1.8 L IS USM for zoom, the Canon RF 5.2mm f/2.8 L Dual Fisheye for wide-angle.
Who should choose the Canon RF 135mm f/1.8 L IS USM?
Choose the Canon RF 135mm f/1.8 L IS USM if you want more light and background blur — f/1.8 is faster than f/2.8, better for low light and subject separation. Choose it if you need more reach — it goes to 135mm vs 5mm 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. Choose it if you like close-focus work — 0.26x magnification vs 0.03x.
Who should choose the Canon RF 5.2mm f/2.8 L Dual Fisheye?
Choose the Canon RF 5.2mm f/2.8 L Dual Fisheye if you shoot wide — it starts at 5mm vs 135mm for landscapes, interiors and architecture. Choose it if you value portability — at 395g (13.9 oz) it's lighter than the 935g (2.06 lb) alternative for travel and all-day carry.
What is the main difference between the Canon RF 135mm f/1.8 L IS USM and the Canon RF 5.2mm f/2.8 L Dual Fisheye?
Aperture: the Canon RF 135mm f/1.8 L IS USM opens to f/1.8 vs the Canon RF 5.2mm f/2.8 L Dual Fisheye's f/2.8 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 135mm | 5mm |
| Lens Type | Prime | Prime |
| Optical Elements | 17 | 10 |
| Optical Groups | 12 | 7 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.8 | f/2.8 |
| Minimum Aperture | f/22 | f/22 |
| Aperture Blades | 11 | 6 |
| Rounded Aperture | Yes | No |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | Canon RF | Canon RF |
| Angle of View | 18° – 18° | 154° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | Dual Nano USM | Nano USM |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | No |
| Min Focus Distance | 70 cm | 13 cm |
| Max Magnification | 0.26x | 0.03x |
| Stabilization & Video | ||
| Optical Stabilization | Yes | No |
| Aperture Ring | No | No |
| Declickable Aperture | No | No |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $2,199 | $2,099 |
| Filter Size | 82mm | − |
| Diameter | 89.2mm | 92.1mm |
| Length | 130.3mm | 63.2mm |
| Weight | 935g (2.06 lb) | 395g (13.9 oz) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
