Sirui 20mm T1.8 1.33x S35 Autofocus Anamorphic Lens
In The Box
- Sirui 20mm T1.8 1.33x S35 Autofocus Anamorphic Lens
- Carrying Pouch
- Carrying Strap
- Front Lens Cap
- Back Lens Cap
Features
Combining the cinematic quality of 2.35:1 widescreen imagery with the convenience of subject-tracking autofocus, this Sirui 20mm T1.8 1.33x S35 AF Anamorphic Lens is a versatile, wide-angle lens designed specifically for Sony E / Fujifilm X / Nikon Z / MFT mount cameras with Super 35 sensors. With a 1.33x squeeze factor and T1.8 maximum aperture, the lens ensures exceptional low-light performance and allows for stunning subject isolation with its signature oval-shaped bokeh.
Powered by a precision STM stepping motor, the Sirui 20mm delivers smooth, accurate, and quiet autofocus—a rare feature in anamorphic lenses. With eye-tracking capability and buttons for both focus mode and autofocus lock, the lens provides complete creative control. A female USB-C port enables firmware updates, ensuring lasting performance. Compact and lightweight, the lens fits advanced technology and visual quality into a form factor ideal for handheld, gimbal, and run-and-gun shooting, making it a powerful tool for independent creators and professional productions.
Anamorphic Aesthetic
1.33x squeeze factor for 2.35:1 images with a 16:9 sensor
Unique oval bokeh enhances subject separation and depth
Horizontal field of view equivalent to a 22mm full-frame lens
Blue lens / Neutral lens flares for cinematic effect
Optical Performance
37mm image circle covers Super 35 sensors or full-frame with vignette
T1.8 to T22 aperture for low-light performance and depth of field control
15.7″ minimum focus distance for close-up shots
Aspherical lens element minimizes chromatic aberration
Advanced Autofocus
STM stepping motor for smooth, silent autofocus
Eye-tracking autofocus for reliability during movement
AF/MF switch to toggle between autofocus and manual focus
AF-lock button to hold focus or recall custom focus settings
Practical Design
Uniform gear positioning with Sirui 40mm AF Anamorphic Lens
Compact (3.8″ long) and lightweight (1.1 lb)
360° focus throw with standard gearing
Versatile Compatibility
Compatible with Sony E / Fujifilm X / Nikon Z / MFT mount cameras
Standard 77mm front filter thread
Update lens firmware via female UCB-C port
| Focal Length |
20mm |
| Maximum Aperture |
T1.8 |
| Minimum Aperture |
T22 |
| Lens Mount |
Sony E / Fujifilm X / Nikon Z / MFT |
| Interchangeable Mount |
No |
| Horizontal Squeeze (Anamorphic) |
1.33x |
| Flare Color |
Blue / Neutral |
| Lens Format Coverage |
Super35/APS-C |
| Image Circle |
37.0 mm |
| Angle of View |
Super 35
Horizontal: 85.6°
Vertical: 44.2° |
| Focus Scales |
No |
| Optical Design |
16 Elements in 12 Groups |
| Filter Thread |
77 mm x 0.75 |
| Minimum Focus Distance |
1.3′ / 0.4 m |
| Diaphragm Blades |
11 |
| Image Stabilization |
No |
| Gear Standard |
0.8 MOD |
| Gear Rotation |
Focus: 360° |
| Electronic Communication |
Yes |
| Camera Connection |
1 x USB-C Firmware |
| Diameter |
Focus Ring: 3.4″ / 86.4 mm
Iris Ring: 3.1″ / 80 mm |
| Length |
3.59″ / 91.25 mm |
| Weight |
1.1 lb / 488.4 g |
