Sirui Astra AF 50mm T1.8 1.33x Full-Frame Anamorphic Lens
In The Box
- Sirui Astra 50mm T1.8 1.33x Auto Focus Anamorphic Lens
- Lens Cap
- Lens Cleaning Cloth
- Carrying Bag
Sirui Astra AF 50mm T1.8 1.33x Full-Frame Anamorphic Lens
The Sirui Astra 50 mm T1.8 1.33× is a groundbreaking full-frame anamorphic cine lens — the first in its class to combine 1.33× squeeze, T1.8 aperture, and autofocus in a compact form. Designed for mirrorless cinematographers, this lens delivers a cinematic widescreen look with natural subject separation, smooth bokeh, and the classic horizontal flare character. With a constant T1.8 across its focal range and support for E, Z, and L mounts, it brings high-end anamorphic aesthetics into a workflow-friendly, lightweight package.
Built with 18 optical elements (including cylindrical and aspherical lenses), it offers excellent image quality across the frame. The lens body is crafted from aluminum alloy with triple protection (dust, dirt, raindrop), making it durable for professional use. Its autofocus system uses a silent STM motor and features an AF/MF switch, autofocus lock (FN), iris lock, and stepped or stepless aperture control — all giving you flexibility for different shooting styles.Its design supports full-frame sensors (44 mm image circle) and has a minimum focus distance of 0.5 m, enabling creative close-ups. The lens comes in two classic flare styles: Blue (sci-fi, vibrant) and Neutral (more organic).
Key Features
- Full-frame coverage — 44 mm image circle supports full-frame mirrorless cameras
- 1.33× constant squeeze, delivering ~2.35:1 aspect ratio on a 16:9 sensor
- Fast aperture: T1.8 – supports low-light shooting, creates shallow depth of field
- Autofocus + Manual: STM motor, AF/MF switch, AF lock (FN), iris lock, stepped or de-clicked aperture
- Flare styles: selectable Blue or Neutral for different cinematic moods
- Robust build: aluminum alloy body, triple protection (dust, dirt, raindrop)
- Dual scale: focus markings in feet and meters
- Filter thread: 67 mm
Best Suitable
- Cinematographers or content creators who want a full-frame anamorphic look but with the ease of autofocus.
- Independent filmmakers, solo shooters, or run-and-gun creators who need quick, reliable focusing.
- Projects that benefit from widescreen cinematic aspect ratios (e.g., narrative films, music videos, commercials).
- Users who want a lightweight yet high-quality anamorphic lens that pairs with mirrorless cameras (E-mount, Z-mount, L-mount, etc.).
- Those who want creative flexibility with flare styles (blue or neutral) depending on mood and lighting.
FAQ – Sirui Astra AF 50mm T1.8 1.33x Full-Frame Anamorphic Lens
Does the Astra 50 mm support full-frame sensors?
Yes, the Astra Series is designed for full-frame, with a 44 mm image circle.
What mounts are available?
It’s available in Sony E, Nikon Z, and L-mount, according to Sirui’s spec sheet.
Can I switch between autofocus and manual focus?
Yes, it has an AF/MF switch, so you can toggle between autofocus and manual focusing.
Will I get lens flares?
Absolutely — the Astra offers two flare styles: Blue (classic sci-fi horizontal streaks) and Neutral (more natural).
What is the minimum focus distance?
The minimum focusing distance is 0.5 m (1.64 ft).
Is the aperture ring stepped or smooth (de-clicked)?
You can toggle between stepped or stepless aperture control — there’s an iris lock so you can fix it in “A” (auto) or manual.
Specifications
| Focal Length |
50 mm |
| Aperture Range |
T1.8 – T22 |
| Lens Structure |
18 elements in 14 groups (includes 4 cylindrical, 1 aspherical) |
| Aperture Blades |
11 |
| Minimum Focus Distance |
0.5 m (1.64 ft) |
| Focus Method |
Auto Focus / Manual Focus (STM) |
| Max Magnification |
1:7.2 (V), 1:10.2 (H) |
| Field of View (Full Frame) |
27.8° (V) / 56.8° (H) / 60.9° (Diagonal) |
| Filter Thread |
M67 × 0.75 mm |
| Focus Ring Rotation Angle |
136° |
| Maximum Diameter |
80 mm |
| Outer Diameter |
72 mm |
| Lens Length (Exclude Cap) |
E: 131 mm; Z: 133 mm; L: 128.9 mm |
| Weight |
E Mount: ~620 g; Z: ~636 g; L: ~625 g |
| Squeeze Factor |
1.33× |
| Flare Style |
Blue / Neutral |
| Special Features |
AF/MF Switch, AF Lock (FN), Iris Lock, Click On/Off |
