Overview
The SIRUI Astra 100mm T1.8 1.33x Full-Frame AF Anamorphic Cine Lens combines a classic anamorphic look with fast, precise autofocus for an efficient mirrorless workflow. With a constant 1.33x squeeze ratio, it restores a widescreen cinematic look (2.35:1) without cropping or pixel loss.
Featuring a 44mm image circle for full-frame coverage and a T1.8 fast aperture for low-light shooting, the Astra Series is designed to deliver oval bokeh and vertical background stretch while keeping a compact, production-ready form factor.
Core Features
- Maintains a constant 1.33x squeeze ratio for a widescreen anamorphic look without cropping or pixel loss.
- T1.8 fast aperture provides ample light for low-light and night scenes and creates shallow depth of field.
- Fast and precise autofocus improves efficiency for solo operators or small teams.
- Two flare options (blue flare and neutral flare) emphasize classic anamorphic character.
- 44mm image circle fully covers full-frame sensors for mirrorless compatibility.
- Oval bokeh and vertical background stretch deliver classic cinematic artistry.
Workflow & Controls
- AF / MF switch for quick focus mode changes.
- FN button for autofocus lock/customization.
- IRIS LOCK locks at “A” for auto aperture or enables manual aperture control.
- CLICK ON / OFF enables stepped or stepless aperture control.
Design & Protection
- Triple protection: dustproof, dirt-resistant, and raindrop-resistant.
- Identical gear position across the set for faster swapping.
- 67mm filter thread and 72mm outer diameter.
- Dual scale markings in feet and meters.
General
| Format Coverage | Full Frame |
| Focal Length | 100mm |
| Squeeze Ratio | 1.33x (Constant) |
| Image Circle | 44mm |
Optical
| Lens Structure | 18 Elements in 13 Groups (5 Cylindrical Lenses) |
| FOV (Full Frame) | 18.4° (V) / 27.4° (H) / 32.3° (D) |
| Filter Size | M67 × P0.75 |
Aperture
| Aperture Range | T1.8 to T22 |
| Aperture Blades | 13 |
| Aperture Ring Diameter | 75.2mm / 2.96 inch |
| CLICK ON / OFF | Stepped aperture / stepless aperture |
| IRIS LOCK | Lock at “A” for auto aperture; switch for manual aperture control |
Focus
| Focus Method | MF / AF |
| Focus Motor | STM |
| Shooting Distance | 0.7 m (2.3 ft) to ∞ |
| Max Magnification | 1: 7.5 (V) / 1: 10.0 (H) |
| Focus Ring Rotation Angle | 136° |
| FN | Auto focus lock/customization |
Physical
| Focus Ring Diameter | Φ80mm / 3.15 inch |
| Outer Diameter | Φ72mm |
| Protection | Triple protection (Dustproof, Dirt-Resistant, Raindrop-Resistant) |
| Dual Scale | Feet/Meter |
What's Included
- SIRUI Astra 100mm T1.8 1.33x Full-Frame AF Anamorphic Cine Lens (Sony E, Neutral Flare)
- Front Lens Cap
- Rear Lens Cap
- Lens Cleaning Cloth
- Carrying Bag
- Barcode: 87597
- UPC Barcode: 6952060078304
- Supplier Code: AST-100-EN