Sirui Astra 50mm
With a 44mm image circle covering full-frame sensors, a constant T1.8 aperture, and 1.33x anamorphic squeeze for native 2.35:1 output, this autofocus, weather-sealed lens delivers cinematic character with reliable stabilization. Selectable blue or neutral flares and an AF/MF switch supporting LiDAR follow-focus provide direct, precise look control rarely seen in anamorphic primes. It’s best for independent filmmakers and portrait shooters needing anamorphic rendering and low-light flexibility in close-up scenarios on Sony E-mount bodies.
Snapshot
Pros & Cons
Pros
- Strong macro (96th percentile) 96th
- Strong aperture (93th percentile) 93th
- Strong bokeh (91th percentile) 91th
- Strong stabilization (81th percentile) 81th
Cons
- Below average social proof (13th percentile)
- Below average optical (17th 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 5 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 |
Aperture
| Max Aperture | T1.8 |
| Min Aperture | T1.8 |
| Constant | Yes |
Build
| Mount | Leica L |
| Format | full-frame |
| Weather Sealed | Yes |
| Weight | 0.6 kg / 1.4 lbs |
AF & Stabilization
| AF Type | Autofocus |
| Stabilization | Yes |
Focus
| Min Focus Distance | 44 |
vs Competition
| Spec | Sirui Astra 50mm | 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 | Nikon NIKKOR Z 28-400mm f/4-8 VR | Panasonic LUMIX G Leica DG Vario-Elmarit H-ES50200 | Viltrox 13mm F1.4 f/1.4 E STM Auto Focus Ultra Wide Angle |
|---|---|---|---|---|---|---|
| Focal Length | 50mm | 16-300mm | 18-300mm | 28-400mm | 50-200mm | 13mm |
| Max Aperture | T1.8 | f/3.5 | f/3.5 | f/4 | f/2.8 | f/1.4 |
| Mount | Leica L | Sony E | Fuji X | Nikon Z | Micro Four Thirds | Sony E |
| Stabilization | true | true | true | true | true | true |
| Weather Sealed | true | true | false | true | true | false |
| Weight (g) | 626 | 615 | 92 | 726 | 655 | 415 |
| AF Type | Autofocus | HLA | VXD linear motor | STM | linear motor | STM |
| Lens Type | prime | zoom | zoom | zoom | telephoto | Wide-Angle |
| Compare | Compare | Compare | Compare | Compare |
| Product | Af | Bokeh | Build | Macro | Optical | Aperture | Versatility | Social Proof | Stabilization |
|---|---|---|---|---|---|---|---|---|---|
| Sirui Astra 50mm | 54.5 | 90.6 | 41.7 | 96 | 16.7 | 92.8 | 34.2 | 12.6 | 81.3 |
| Sigma Contemporary 16-300mm f/3.5-6.7 DC OS Compare | 54.5 | 84.3 | 59 | 85.9 | 98.9 | 76.9 | 99.6 | 78 | 99.1 |
| Tamron Di III 18-300mm f/3.5-6.3 Di III-A VC VXD Compare | 98.3 | 74.9 | 96.6 | 87.7 | 74.6 | 76.9 | 99.2 | 83.1 | 81.3 |
| Nikon NIKKOR Z 28-400mm f/4-8 VR Compare | 86.9 | 77.8 | 51.6 | 81.3 | 97 | 71.2 | 98.9 | 83.1 | 98.3 |
| Panasonic LUMIX G Leica DG Vario-Elmarit H-ES50200 Compare | 98.3 | 86.1 | 55.3 | 23.1 | 95.9 | 83.7 | 88.3 | 65.9 | 96.4 |
| Viltrox 13mm F1.4 f/1.4 E STM Auto Focus Ultra Wide Angle Compare | 86.9 | 96.6 | 42.1 | 89.4 | 82.6 | 96.4 | 34.2 | 74 | 81.3 |
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
