Rokinon RK20M-C
The f/1.8 aperture and 20mm full-frame field of view, supported by 2 aspherical and 3 ED elements with Ultra Multi-Coating, produce sharp, contrasty images with minimal flare. Its 497g weight and damped manual focus ring encourage precise, deliberate composition on a tripod. This lens is a solid choice for astrophotographers and low‑light landscape shooters using Canon EF who can trade autofocus for strong wide‑angle optics.
About This Lens
The f/1.8 aperture and 20mm full-frame field of view, supported by 2 aspherical and 3 ED elements with Ultra Multi-Coating, produce sharp, contrasty images with minimal flare. Its 497g weight and damped manual focus ring encourage precise, deliberate composition on a tripod. This lens is a solid choice for astrophotographers and low‑light landscape shooters using Canon EF who can trade autofocus for strong wide‑angle optics.
- Focal length 20mm
- Max aperture 22
- Mount Canon EF
- Weight g 497
- Af type manual focus only
- Lens type prime
Overview
Performance
Pros & Cons
Pros
- Strong optical (84th percentile) 84th
- Strong macro (81th percentile) 81th
Cons
- Below average af (14th percentile) 14th
- Below average bokeh (15th percentile) 15th
- Below average aperture (24th percentile) 24th
- Below average social proof (30th percentile) 30th
Specifications
Full Specifications
Optics
| Type | prime |
| Focal Length Min | 20 |
| Focal Length Max | 20 |
| Elements | 13 |
| Groups | 12 |
| Aspherical Elements | 2 |
| ED Elements | 3 |
| Coating | Ultra Multi-Coating |
Aperture
| Max Aperture | 22 |
| Min Aperture | 1.8 |
| Constant | No |
| Diaphragm Blades | 7 |
Build
| Mount | Canon EF |
| Format | full-frame |
| Weather Sealed | No |
| Weight | 0.5 kg / 1.1 lbs |
| Filter Thread | 77 |
AF & Stabilization
| AF Type | manual focus only |
| Stabilization | No |
Focus
| Min Focus Distance | 200 |
Value & Pricing
vs Competition
| Spec | Rokinon RK20M-C | Sigma Contemporary 16-300mm f/3.5-6.7 DC OS | Nikon NIKKOR Z 28-400mm f/4-8 VR | Tamron Di III 18-300mm f/3.5-6.3 Di III-A VC VXD | Panasonic LUMIX S S-R28200 | Viltrox 13mm f/1.4 F1.4 Z-Mount |
|---|---|---|---|---|---|---|
| Focal Length | 20mm | 16-300mm | 28-400mm | 18-300mm | 28-200mm | 13mm |
| Max Aperture | 22 | f/3.5 | f/4 | f/3.5 | f/4 | f/1.4 |
| Mount | Canon EF | Sony E | Nikon Z | Fuji X | L-Mount | Nikon Z |
| Stabilization | false | true | true | true | true | true |
| Weather Sealed | false | true | true | false | true | false |
| Weight (g) | 497 | 615 | 726 | 92 | 413 | 415 |
| AF Type | manual focus only | HLA | STM | VXD linear motor | Autofocus | STM |
| Lens Type | prime | zoom | zoom | zoom | macro | Wide-Angle |
| Compare | Compare | Compare | Compare | Compare |
| Product | Af | Bokeh | Build | Macro | Optical | Aperture | User Sentiment | Versatility | Social Proof | Stabilization |
|---|---|---|---|---|---|---|---|---|---|---|
| Rokinon RK20M-C | 13.9 | 15.3 | 50.7 | 81.2 | 84.3 | 23.9 | 63.1 | 34 | 30 | 35.7 |
| Sigma Contemporary 16-300mm f/3.5-6.7 DC OS Compare | 54.1 | 84 | 59 | 85.6 | 98.8 | 76.4 | 0 | 99.7 | 89.4 | 99.1 |
| Nikon NIKKOR Z 28-400mm f/4-8 VR Compare | 86.5 | 77 | 51.5 | 81.2 | 96.9 | 70.7 | 0 | 98.9 | 73.9 | 98.3 |
| Tamron Di III 18-300mm f/3.5-6.3 Di III-A VC VXD Compare | 98.2 | 74.1 | 96.5 | 87.5 | 74.5 | 76.4 | 29.8 | 99.3 | 68 | 80.9 |
| Panasonic LUMIX S S-R28200 Compare | 54.1 | 77 | 74.3 | 71.1 | 91.1 | 70.7 | 0 | 95.7 | 89.4 | 99.4 |
| Viltrox 13mm f/1.4 F1.4 Z-Mount Compare | 86.5 | 96.5 | 42.2 | 89.2 | 82.5 | 96.2 | 80.3 | 34 | 65 | 80.9 |
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
