Overview
The SIRUI Astra 50mm, 75mm & 100mm T1.8 1.33x Full-Frame AF Anamorphic Cine Lens 3-Lens Kit pairs three focal lengths with uniform color and tone for fast swapping and easier post-production. Each lens maintains a constant 1.33x squeeze ratio to restore a classic 2.35:1 widescreen cinematic look from 16:9 capture—no cropping, no pixel loss.
With fast and precise autofocus, the Astra Series improves efficiency for solo operators and small teams, bringing an anamorphic workflow that is ready for professional cinematic production.
Core Features
- Uniform color and tone across three focal lengths for easier swapping and post-production.
- Constant 1.33x squeeze ratio delivers a widescreen cinematic look without cropping or pixel loss.
- T1.8 fast aperture provides ample light for low-light scenes and creates shallow depth of field.
- Fast and precise autofocus increases shooting efficiency without requiring a focus puller.
- Two flare options (blue flare and neutral flare) reveal a distinctive cinematic look.
- Oval bokeh and vertical background stretch create classic anamorphic artistry.
Close-Up Performance
Easily capture portraits and vivid close-ups with rich detail. The T1.8 fast aperture adds depth, texture, and atmosphere.
System & Handling
- 44mm image circle fully covers full-frame sensors for mirrorless compatibility.
- Identical gear position across the set supports faster lens changes.
- Triple protection: dustproof, dirt-resistant, and raindrop-resistant.
- AF / MF switch, FN autofocus lock/customization, IRIS LOCK, and CLICK ON / OFF controls.
General
| Format Coverage | Full Frame |
| Squeeze Ratio | 1.33x (Constant) |
| Image Circle | 44mm |
Aperture
| Aperture Range | T1.8 to T22 (All Lenses) |
| CLICK ON / OFF | Stepped aperture / stepless aperture |
| IRIS LOCK | Lock at “A” for auto aperture; switch for manual aperture control |
Optical
| Filter Size | M67 × P0.75 (All Lenses) |
| Outer Diameter | Φ72mm |
| Max Diameter | Φ80mm / 3.15 inch (E/Z/L Mount) |
Focus
| Focus Method | MF / AF |
| Focus Motor | STM |
| Focus Ring Rotation Angle | 136° |
| FN | Auto focus lock/customization |
| AF / MF Switch | Switch between auto focus and manual focus |
Lens Structure
| 50mm | 75mm | 100mm | |
| Lens Structure | 18 Elements in 14 Groups (4 Cylindrical Lenses and 1 Aspherical Lens) | 18 Elements in 13 Groups (4 Cylindrical Lenses and 1 Aspherical Lens) | 18 Elements in 13 Groups (5 Cylindrical Lenses) |
| Aperture Blades | 11 | 13 | 13 |
| Shooting Distance | 0.5 m (1.64 ft) to ∞ | 0.6 m (1.97 ft) to ∞ | 0.7 m (2.3 ft) to ∞ |
| Max Magnification | 1: 7.2 (V) / 1: 10.2 (H) | -0.165 (V) / -0.123 (H) | 1: 7.5 (V) / 1: 10.0 (H) |
| FOV (Full Frame) | 27.8° (V) / 56.8° (H) / 60.9° (D) | 18.52° (V) / 36.9° (H) / 40.37° (D) | 18.4° (V) / 27.4° (H) / 32.3° (D) |
Physical
| 50mm | 75mm | 100mm | |
| Length (Exclude Lens Cap) | E Mount: 131mm / 5.16 inch Z Mount: 133mm / 5.24 inch L Mount: 128.9mm / 5.07 inch | E Mount: 131mm / 5.16 inch Z Mount: 133mm / 5.24 inch L Mount: 128.9mm / 5.07 inch | E Mount: 135.3mm / 5.33 inch Z Mount: 137.3mm / 5.41 inch L Mount: 133.2mm / 5.24 inch |
| Weight (Exclude Lens Cap) | E Mount: 620g / 1.37 lb Z Mount: 636g / 1.4 lb L Mount: 625g / 1.38 lb | E Mount: 650g / 1.43 lb Z Mount: 666g / 1.47 lb L Mount: 655g / 1.44 lb | E Mount: 700g / 1.54 lb Z Mount: 716g / 1.58 lb L Mount: 705g / 1.55 lb |
Construction
| Protection | Triple protection (Dustproof, Dirt-Resistant, Raindrop-Resistant) |
| Dual Scale | Feet/Meter |
| Identical Gear Position | Yes |
What's Included
- SIRUI Astra 50mm T1.8 1.33x Full-Frame AF Anamorphic Cine Lens (L-Mount, Blue Flare)
- SIRUI Astra 75mm T1.8 1.33x Full-Frame AF Anamorphic Cine Lens (L-Mount, Blue Flare)
- SIRUI Astra 100mm T1.8 1.33x Full-Frame AF Anamorphic Cine Lens (L-Mount, Blue Flare)
- 3 x Front Lens Cap
- 3 x Rear Lens Cap
- Lens Cleaning Cloth
- Hard Case
- Barcode: 87606
- UPC Barcode: 6952060078137
- Supplier Code: AST-3S-LB