Rokinon 20mm f/1.8 ED AS UMC Wide-Angle Lens
The Rokinon 20mm f/1.8 is a 20mm f/1.8 lens designed for Canon EF, Nikon F, Sony E, Micro Four Thirds mount cameras. Used copies start from $199.99 on GearFocus, with buyer protection on every purchase.
Rokinon 20mm f/1.8 ED AS UMC Wide-Angle Lens
Used Rokinon 20mm f/1.8 Listings on GearFocus
Lens Overview — Rokinon 20mm f/1.8
Key Features — Rokinon 20mm f/1.8
20mm f/1.8 Prime: A fixed 20mm focal length with a fast f/1.8 maximum aperture makes this lens well suited for astrophotography, landscapes, and low-light wide-angle shooting.
Full-Frame Coverage: Designed to cover a full-frame image circle with no vignetting on full-frame sensor bodies.
ED and AS Optical Elements: Extra-low dispersion and aspherical elements help reduce chromatic aberration and distortion across the frame.
UMC Lens Coating: Ultra Multi-Coating minimizes flare and ghosting when shooting in high-contrast or backlit situations.
Manual Focus Design: No autofocus motor is present, giving photographers and videographers precise, deliberate focus control.
Multiple Mount Options: Available in Canon EF, Nikon F, Sony E, and Micro Four Thirds mounts for broad camera system compatibility.
Lens Specifications — Rokinon 20mm f/1.8
| Spec | Detail |
|---|---|
| Use Cases | Astrophotography, Travel |
| Lens Type | Wide-Angle |
| Format | Full Frame |
| Zoom/Prime | Prime |
| Focal Length | 20mm |
| Maximum Aperture | f/1.8 |
| Camera System | DSLR |
| Lens Mount | Canon EF, Nikon F, Sony E, Micro Four Thirds |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 77mm |
Description — Rokinon 20mm f/1.8
The Rokinon 20mm f/1.8 ED AS UMC Wide-Angle Lens is a manual-focus prime built to cover full-frame sensor formats at a fixed 20mm focal length. With a fast f/1.8 maximum aperture, this lens opens up possibilities in challenging lighting conditions and gives photographers meaningful control over depth of field even at wide angles. It is available in Canon EF, Nikon F, Sony E, and Micro Four Thirds mounts, offering genuine cross-system versatility for those who shoot on multiple platforms.
The 77mm filter thread fits neatly into standard filter ecosystems, and the lens weighs just 500g, keeping the overall kit weight reasonable. There is no autofocus and no image stabilization, making this lens best suited to photographers who prefer deliberate, manual-control workflows — astrophotographers, landscape shooters, and videographers will find the manual focus particularly well matched to their needs. The prime design keeps the optical path fixed at 20mm, delivering a consistent wide-angle perspective across every shot.
Pros — Rokinon 20mm f/1.8
- ✓Fast f/1.8 maximum aperture at 20mm enables strong low-light shooting performance
- ✓Full-frame coverage (lensFormat: Full Frame) means no crop concerns on full-frame bodies
- ✓Wide mount compatibility across Canon EF, Nikon F, Sony E, and Micro Four Thirds systems
Cons — Rokinon 20mm f/1.8
- ✗Manual focus only — no autofocus support, which may slow down fast-paced shooting
- ✗No image stabilization, requiring steady technique or external stabilization
- ✗Fixed 20mm focal length offers no zoom flexibility for framing adjustments
Reviews — Rokinon 20mm f/1.8
Videos — Rokinon 20mm f/1.8
Samyang 20mm f/1.8 lens review with samples (Full-frame & APS-C) — Christopher Frost
Frequently Asked Questions — Rokinon 20mm f/1.8
Does this lens support autofocus?+
No. The Rokinon 20mm f/1.8 is a manual-focus-only lens — the autoFocus specification is listed as false and focusType is listed as Manual. Photographers will need to focus by hand using the focus ring.
Which camera mounts is this lens available in?+
This lens is available in Canon EF, Nikon F, Sony E, and Micro Four Thirds mounts. Be sure to select the correct mount version for your specific camera body when purchasing.
Will this lens cover a full-frame sensor?+
Yes. The lensFormat specification is listed as Full Frame, meaning it is designed to cover a full-frame image circle without vignetting on compatible full-frame bodies.
What filter size does the Rokinon 20mm f/1.8 use?+
The lens has a 77mm filter thread, which is a common size compatible with a wide range of circular and screw-in filters available from most filter manufacturers.
Does this lens include image stabilization?+
No. The imageStabilization specification is listed as None. Photographers shooting in low light or at slower shutter speeds should account for this and use appropriate technique or camera-body stabilization if available.
How much does the Rokinon 20mm f/1.8 weigh?+
The lens weighs 500 grams, making it a manageable option for extended handheld shooting sessions or travel photography.