Rokinon RK20M-C 20mm
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
Aperture 22
Mount Canon EF
Weight 497 g
af type manual focus only
lens type prime
38 Overall Score
Price €0
Snapshot
Pros & Cons
Pros
- Strong optical (84th percentile) 84th
- Strong macro (82th percentile) 82th
Cons
- Below average af (15th percentile)
- Below average bokeh (17th percentile)
- Below average aperture (26th 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.
85/100Our AI sentiment read
Based on 7 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
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 |
vs Competition
| Spec | Rokinon RK20M-C 20mm | Sigma Contemporary 16-300mm f/3.5-6.7 DC OS | Tamron Di III 18-300mm f/3.5-6.3 Di III-A VC VXD | Panasonic LUMIX S S-R28200 | Sony G Master SEL70200GM2 | Nikon NIKKOR AF-S DX NIKKOR 16-85mm f/3.5-5.6G ED VR |
|---|---|---|---|---|---|---|
| Focal Length | 20mm | 16-300mm | 18-300mm | 28-200mm | 70-200mm | 16-85mm |
| Max Aperture | 22 | f/3.5 | f/3.5 | f/4 | 2.8 | f/3.5 |
| Mount | Canon EF | Sony E | Fuji X | L-Mount | Sony E | Nikon F |
| Stabilization | false | true | true | true | true | true |
| Weather Sealed | false | true | false | true | true | false |
| Weight (g) | 497 | 615 | 92 | 413 | 1045 | 59 |
| AF Type | manual focus only | HLA | VXD linear motor | Autofocus | XD Linear Motors | AF-S |
| Lens Type | prime | zoom | zoom | macro | telephoto | zoom |
| Compare | Compare | Compare | Compare | Compare |
| Product | Af | Bokeh | Build | Macro | Optical | Aperture | User Sentiment | Versatility | Social Proof | Stabilization |
|---|---|---|---|---|---|---|---|---|---|---|
| Rokinon RK20M-C 20mm | 15.2 | 16.5 | 49.3 | 81.6 | 83.5 | 25.6 | 63.9 | 34 | 39.8 | 35.7 |
| Sigma Contemporary 16-300mm f/3.5-6.7 DC OS Compare | 54.7 | 86.4 | 57.7 | 86.4 | 98.9 | 79.8 | 0 | 99.6 | 77.7 | 99 |
| Tamron Di III 18-300mm f/3.5-6.3 Di III-A VC VXD Compare | 98.1 | 78 | 96.2 | 88.3 | 73.4 | 79.8 | 29.8 | 99.2 | 82.8 | 80.6 |
| Panasonic LUMIX S S-R28200 Compare | 54.7 | 80.7 | 73.6 | 89.4 | 90.9 | 74.5 | 0 | 95.7 | 62.5 | 99.4 |
| Sony G Master SEL70200GM2 Compare | 98.1 | 92.3 | 33.5 | 33 | 87 | 85.9 | 81.1 | 79.4 | 94.7 | 80.6 |
| Nikon NIKKOR AF-S DX NIKKOR 16-85mm f/3.5-5.6G ED VR Compare | 54.7 | 78 | 98.5 | 58.8 | 64.2 | 79.8 | 81.1 | 94.3 | 87.7 | 92.3 |
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
