Sigma EX DC HSM 4.5mm f/2.8 EX DC HSM 5mm
Its constant f/2.8 aperture paired with a 135mm close focus limit produces an exceptionally bright 180-degree circular image on APS-C sensors. The lens’s equisolid angle projection provides a mathematically quantifiable field of view useful for scientific measurement, while the HSM motor enables silent autofocus with full-time manual override. This specialist optic is best suited for astrophotographers capturing auroras or researchers documenting canopy distribution.
Snapshot
Pros & Cons
Pros
- Strong macro (89th percentile) 89th
- Strong aperture (84th percentile) 84th
- Strong bokeh (82th percentile) 82th
Cons
- Below average user sentiment (8th percentile)
- Below average versatility (34th percentile)
- Below average build (34th percentile)
What owners think
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews — so you can see whether early praise held up.
Based on 13 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
Specifications
Full Specifications
Optics
| Type | fisheye |
| Focal Length Min | 4 |
| Focal Length Max | 4 |
| Coating | Super Multi-Layer Coating |
Aperture
| Max Aperture | f/2.8 |
| Min Aperture | 2.8 |
| Constant | Yes |
Build
| Mount | Canon EF |
| Format | APS-C |
| Weight | 0.5 kg / 1.0 lbs |
AF & Stabilization
| AF Type | HSM |
| Stabilization | No |
Focus
| Min Focus Distance | 135 |
| Max Magnification | 1:6 |
vs Competition
| Spec | Sigma EX DC HSM 4.5mm f/2.8 EX DC HSM 5mm | Tamron Di III 18-300mm f/3.5-6.3 Di III-A VC VXD | Nikon NIKKOR Z 28-400mm f/4-8 VR | Panasonic LUMIX G Leica DG Vario-Elmarit H-ES50200 | Canon EF-S 18-135mm f/3.5-5.6 IS USM | Sony E SELP1650 |
|---|---|---|---|---|---|---|
| Focal Length | 4mm | 18-300mm | 28-400mm | 50-200mm | 18-135mm | 16-50mm |
| Max Aperture | f/2.8 | f/3.5 | f/4 | f/2.8 | f/3.5 | f/3.5 |
| Mount | Canon EF | Fuji X | Nikon Z | Micro Four Thirds | Canon EF-S | Sony E |
| Stabilization | false | true | true | true | true | true |
| Weather Sealed | false | false | true | true | false | false |
| Weight (g) | 472 | 92 | 726 | 655 | 515 | 116 |
| AF Type | HSM | VXD linear motor | STM | linear motor | STM | Stepping motor |
| Lens Type | fisheye | zoom | zoom | telephoto | zoom | zoom |
| Compare | Compare | Compare | Compare | Compare |
| Product | Af | Bokeh | Build | Macro | Optical | Aperture | User Sentiment | Versatility | Social Proof | Stabilization |
|---|---|---|---|---|---|---|---|---|---|---|
| Sigma EX DC HSM 4.5mm f/2.8 EX DC HSM 5mm | 54.9 | 81.8 | 34.4 | 89.1 | 35.2 | 84.1 | 7.5 | 34.1 | 56.1 | 35.9 |
| Tamron Di III 18-300mm f/3.5-6.3 Di III-A VC VXD Compare | 98.2 | 75.5 | 96.4 | 87.8 | 74.3 | 77.5 | 30.3 | 99.2 | 83.1 | 81.1 |
| Nikon NIKKOR Z 28-400mm f/4-8 VR Compare | 86.6 | 78.4 | 50.8 | 81.2 | 97 | 71.8 | 0 | 98.9 | 83.1 | 98.2 |
| Panasonic LUMIX G Leica DG Vario-Elmarit H-ES50200 Compare | 98.2 | 86.4 | 54.6 | 22.8 | 95.9 | 84.1 | 91.7 | 88.3 | 65.9 | 96.3 |
| Canon EF-S 18-135mm f/3.5-5.6 IS USM Compare | 86.6 | 75.5 | 46.6 | 33.2 | 79.8 | 77.5 | 0 | 96 | 78 | 92.5 |
| Sony E SELP1650 Compare | 86.6 | 75.5 | 93.6 | 35.1 | 64.4 | 77.5 | 63.6 | 83.5 | 74.1 | 92.5 |
Price
Value & Pricing
Amazon.ca 1 offers From CA$1,050
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
