Sigma AF 4.5mm f/2.8 EX DC HSM Circular Fisheye Lens for Canon
The Sigma 4.5mm f/2.8 Circular Fisheye is a 4.5mm f/2.8 lens designed for Canon EF mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Sigma AF 4.5mm f/2.8 EX DC HSM Circular Fisheye Lens for Canon
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Lens Overview — Sigma 4.5mm f/2.8 Circular Fisheye
Key Features — Sigma 4.5mm f/2.8 Circular Fisheye
4.5mm Circular Fisheye: Produces a true circular image on APS-C sensors, with the full 180-degree field of view rendered as a circle surrounded by black.
f/2.8 Maximum Aperture: Solid light-gathering capability for a specialty fisheye lens, allowing use in lower-light environments without extremely slow shutter speeds.
APS-C Format Design: Optimized for APS-C sensors to deliver the circular fisheye effect — on full-frame bodies the image circle will not cover the sensor.
HSM Autofocus Motor: Hyper Sonic Motor enables fast, quiet autofocus operation, useful when shooting subjects in motion with an unconventional perspective.
Canon EF Mount: Compatible with a broad range of Canon EF-mount APS-C DSLRs, including the Rebel, 7D, and 90D series.
Auto and Manual Focus: Supports full-time manual focus override alongside autofocus, giving precise control for creative or technical shooting situations.
Lens Specifications — Sigma 4.5mm f/2.8 Circular Fisheye
| Spec | Detail |
|---|---|
| Use Cases | Creative Effects, Architecture, Landscape |
| Lens Type | Fisheye |
| Format | APS-C / DX |
| Zoom/Prime | Prime |
| Focal Length | 4.5mm |
| Maximum Aperture | f/2.8 |
| Camera System | DSLR |
| Lens Mount | Canon EF |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Weight | 470g |
Description — Sigma 4.5mm f/2.8 Circular Fisheye
The Sigma AF 4.5mm f/2.8 EX DC HSM Circular Fisheye Lens for Canon is a prime fisheye optic built for APS-C format DSLR cameras on the Canon EF mount. At a fixed focal length of 4.5mm, it delivers a circular fisheye perspective that makes it one of the most distinctive specialty lenses available for crop-sensor Canon shooters. The maximum aperture of f/2.8 provides a meaningful advantage in lower-light environments for a lens in this category.
Focus options include both autofocus and manual focus, giving photographers control over how they engage with the lens in various creative scenarios. Weighing 470g, it is a compact enough addition to a specialty kit without feeling overly light for a prime of its nature. Note that there is no image stabilization and no filter thread on this lens — the latter being a typical design characteristic of circular fisheye optics with their dramatically curved front elements.
This lens is purpose-built for photographers wanting to explore the unique circular fisheye aesthetic on compatible Canon EF APS-C DSLR bodies.
Pros — Sigma 4.5mm f/2.8 Circular Fisheye
- ✓Maximum aperture of f/2.8 provides solid light-gathering performance for a specialty fisheye lens
- ✓Supports both autofocus and manual focus operation, offering flexibility across shooting situations
- ✓Designed specifically for APS-C format sensors, producing a true circular fisheye image on compatible cameras
Cons — Sigma 4.5mm f/2.8 Circular Fisheye
- ✗No image stabilization, which can be a drawback when shooting in low-light or handheld situations
- ✗No filter thread available, preventing use of standard screw-on filters
- ✗Strictly an APS-C format lens, limiting compatibility to crop-sensor bodies and not usable for full-frame fisheye coverage
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