Sigma EX DC HSM 4.5mm f/2.8 5mm
The fast f/2.8 aperture and 180-degree circular projection on APS-C sensors make this a specialized tool for low-light scenarios like astrophotography. Its equisolid angle projection method provides quantifiable data for scientific use, while the HSM motor enables quiet autofocus with full-time manual override. This lens is best for aurora photographers and researchers needing precise solid angle measurements of sky or vegetation distribution.
Focal length 4mm
Aperture f/2.8
Mount Canon EF
Weight 472 g
af type HSM
lens type fisheye
50 Overall Score
Price €0
No listings available
Snapshot
Pros & Cons
Pros
- Strong macro (92nd percentile) 92nd
- Strong aperture (86th percentile) 86th
- Strong bokeh (84th percentile) 84th
Cons
- Below average user sentiment (7th percentile)
- Below average versatility (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.
Owner sentiment has improved over time
65/100Our AI sentiment read
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 | f/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 5mm | Nikon NIKKOR Z 17-28mm f/2.8 | Tamron Di III 28-75mm f/2.8 VXD G2 | Panasonic Leica DG Vario-Elmarit H-ES12060 | Canon RF 28-70mm f/2.8 IS STM | Sony G SELP28135G.SYX |
|---|---|---|---|---|---|---|
| Focal Length | 4mm | 17-28mm | 28-75mm | 12-60mm | 28-70mm | 28-135mm |
| Max Aperture | f/2.8 | f/2.8 | f/2.8 | f/2.8 | f/22 | f/4 |
| Mount | Canon EF | Nikon Z | Sony E | Micro Four Thirds | Canon RF | Sony E |
| Stabilization | false | false | false | true | true | true |
| Weather Sealed | false | true | true | true | true | true |
| Weight (g) | 472 | 450 | 540 | 320 | 495 | 420 |
| AF Type | HSM | Stepping Motor | VXD | linear motor | STM | SSM |
| Lens Type | fisheye | zoom | zoom | zoom | 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 5mm | 54.6 | 83.5 | 39.2 | 91.5 | 40.4 | 85.8 | 7.2 | 33.6 | 54.2 | 38 |
| Nikon NIKKOR Z 17-28mm f/2.8 Compare | 87 | 88.1 | 73.6 | 86.3 | 87 | 85.8 | 90.8 | 68.1 | 64.6 | 38 |
| Tamron Di III 28-75mm f/2.8 VXD G2 Compare | 54.6 | 88.1 | 67.2 | 87.3 | 87.8 | 85.8 | 80.4 | 78.2 | 83.1 | 38 |
| Panasonic Leica DG Vario-Elmarit H-ES12060 Compare | 98 | 88.1 | 83.1 | 50.4 | 90.2 | 85.8 | 44.2 | 93.1 | 63.5 | 83.2 |
| Canon RF 28-70mm f/2.8 IS STM Compare | 87 | 25.9 | 70.2 | 80.4 | 85 | 22.6 | 98.1 | 77.2 | 87.9 | 98.5 |
| Sony G SELP28135G.SYX Compare | 94.2 | 80.2 | 75.5 | 31.2 | 87 | 69.9 | 63.3 | 92.4 | 50.2 | 92.8 |
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
