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 Nikon F
Weight 472 g
af type HSM
lens type fisheye
45 Overall Score
Price £0
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Snapshot
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 | Nikon F |
| 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 | Tamron Di III VC 28-300mm f/4-7.1 VXD | Nikon NIKKOR Z 17-28mm f/2.8 | Panasonic Leica DG Vario-Elmarit H-ES12035 | Sony E 18-135mm f/3.5-5.6 OSS | Viltrox Pro AF 27mm f/1.2 |
|---|---|---|---|---|---|---|
| Focal Length | 4mm | 28-300mm | 17-28mm | 12-35mm | 18-135mm | 27mm |
| Max Aperture | f/2.8 | f/4 | f/2.8 | f/2.8 | f/3.5 | f/1.2 |
| Mount | Nikon F | Sony E | Nikon Z | Micro Four Thirds | Sony E | Sony E |
| Stabilization | false | true | false | true | true | false |
| Weather Sealed | false | true | true | true | false | true |
| Weight (g) | 472 | 610 | 450 | 306 | 326 | 560 |
| AF Type | HSM | VXD linear motor | Stepping Motor | Autofocus | Linear motor | STM |
| Lens Type | fisheye | zoom | zoom | zoom | zoom | prime |
| 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 | 53.6 | 81.4 | 43.4 | 89.9 | 45.9 | 83.6 | 7.6 | 33.7 | 60.8 | 36.8 |
| Tamron Di III VC 28-300mm f/4-7.1 VXD Compare | 98.1 | 77.3 | 65.3 | 85 | 96.8 | 65.6 | 91 | 97.8 | 55.9 | 82.5 |
| Nikon NIKKOR Z 17-28mm f/2.8 Compare | 87.2 | 86.6 | 75.9 | 85 | 88.4 | 83.6 | 91 | 68.1 | 70.3 | 36.8 |
| Panasonic Leica DG Vario-Elmarit H-ES12035 Compare | 53.6 | 81.4 | 86.1 | 50.7 | 86.7 | 83.6 | 63.8 | 80.5 | 85.6 | 96.9 |
| Sony E 18-135mm f/3.5-5.6 OSS Compare | 98.1 | 74.8 | 73.2 | 40.1 | 78.9 | 77 | 44.6 | 95.8 | 89.9 | 82.5 |
| Viltrox Pro AF 27mm f/1.2 Compare | 87.2 | 98.7 | 68.3 | 38.2 | 82.5 | 98.5 | 91 | 33.7 | 89.9 | 36.8 |
