Sirui Saturn RF50B-A 50mm
At just 465g, the carbon fiber build makes this the lightest full-frame 1.6x anamorphic, delivering a 2.4:1 or wider 2.8:1 aspect ratio with a T2.9 aperture and 10-blade diaphragm for oval bokeh. Its compact size mounts on gimbals and FPV drones for unique overhead perspectives, and optional blue or natural flare coatings add stylistic control. This manual-focus lens suits solo filmmakers and drone operators prioritizing a portable, cinematic look without heavy rigging.
Snapshot
Pros & Cons
Pros
- Strong stabilization (83rd percentile) 83rd
- Strong user sentiment (80th percentile) 80th
- Strong optical (66th percentile) 66th
Cons
- Below average af (14th 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.
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 | 50 |
| Focal Length Max | 50 |
| Elements | 17 |
| Groups | 12 |
Aperture
| Max Aperture | T16 |
| Min Aperture | T2.9 |
| Constant | Yes |
| Diaphragm Blades | 10 |
Build
| Mount | Canon RF |
| Format | full-frame |
| Weight | 0.5 kg / 1.0 lbs |
| Filter Thread | 62 |
AF & Stabilization
| AF Type | Manual Focus |
| Stabilization | Yes |
Focus
| Min Focus Distance | 900 |
| Max Magnification | 1:16.2 |
vs Competition
| Spec | Sirui Saturn RF50B-A 50mm | Nikon NIKKOR Z DX 18-140mm f/3.5-6.3 VR | Tamron Di III 28-75mm f/2.8 VXD G2 | Sigma Contemporary 10-18mm f/2.8 DC DN | Panasonic Leica DG Vario-Elmarit H-ES12060 | Canon RF 28-70mm f/2.8 IS STM |
|---|---|---|---|---|---|---|
| Focal Length | 50mm | 18-140mm | 28-75mm | 10-18mm | 12-60mm | 28-70mm |
| Max Aperture | T16 | f/3.5 | f/2.8 | f/2.8 | f/2.8 | f/22 |
| Mount | Canon RF | Nikon Z | Sony E | Sony E | Micro Four Thirds | Canon RF |
| Stabilization | true | true | false | false | true | true |
| Weather Sealed | false | true | true | true | true | true |
| Weight (g) | 465 | 315 | 540 | 260 | 320 | 495 |
| AF Type | Manual Focus | stepping motor | VXD | Autofocus | linear motor | STM |
| Lens Type | prime | zoom | zoom | zoom | zoom | zoom |
| Compare | Compare | Compare | Compare | Compare |
| Product | AF | Bokeh | Build | Macro | Optical | Aperture | User Sentiment | Versatility | Social Proof | Stabilization |
|---|---|---|---|---|---|---|---|---|---|---|
| Sirui Saturn RF50B-A 50mm | 13.9 | 44.8 | 56.3 | 43.9 | 66.4 | 45.8 | 80.4 | 33.6 | 46.6 | 83.2 |
| Nikon NIKKOR Z DX 18-140mm f/3.5-6.3 VR Compare | 86.9 | 77.7 | 83.8 | 82.6 | 88.5 | 79.7 | 0 | 96.2 | 32.2 | 96.6 |
| Tamron Di III 28-75mm f/2.8 VXD G2 Compare | 54.6 | 88 | 67.2 | 87.3 | 87.8 | 85.6 | 80.4 | 78.2 | 83.3 | 37.9 |
| Sigma Contemporary 10-18mm f/2.8 DC DN Compare | 54.6 | 83.4 | 87.1 | 93.3 | 81.5 | 85.6 | 80.4 | 69 | 69.2 | 37.9 |
| Panasonic Leica DG Vario-Elmarit H-ES12060 Compare | 98 | 88 | 83 | 50.2 | 90.2 | 85.6 | 44.2 | 93.1 | 63.9 | 83.2 |
| Canon RF 28-70mm f/2.8 IS STM Compare | 86.9 | 25.9 | 70.2 | 80.3 | 85 | 22.6 | 98.1 | 77.1 | 88 | 98.5 |
Price
Value & Pricing
We started tracking prices for this product on Jun 1, 2026. The chart appears once we have more data.
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
