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SIRUI 20mm T1.8 1.33X S35 AF Anamorphic Lens

SKU: 20AF133X-EN
€819,00
VAT included. Shipping will be calculated at checkout.
Flare
Mount

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EXPANSIVE PERSPECTIVE
S35 AUTOFOKUS-ANAMORPHIC LENS
Autofocus, precise tracking

Conventional anamorphic lenses often struggle with fast focus acquisition due to the lack of autofocus. The SIRUI 20mm T1.8 1.33x anamorphic lens is equipped with an STM stepper motor and offers fast, precise, and smooth autofocus.

It also supports eye tracking, ensuring stable and precise focus even during high-speed shooting or video recording – to capture every crucial moment clearly.
Video recording
STM stepper motor, fast focusing & precise tracking
Eye tracking
Unlock a new level of photography and filmmaking.
AF/MF focus modes
Seamlessly switch between autofocus and manual focus to flexibly respond to different shooting scenarios – achieving cinematic quality at a professional level.
20 mm wide-angle perspective
With a horizontal field of view equivalent to that of a 22mm full-frame lens, this wide-angle lens easily captures vast landscapes, a breathtaking starry sky, and tight interiors.
20mm
Approximately 22mm
T1.8
0.4m
Wide angle
Horizontally equivalent to full-frame
Fast aperture
Minimum focus distance
0.4m minimum focusing distance
The 0.4-meter minimum focusing distance breaks the technical limits of conventional anamorphic lenses. Combined with the bright T1.8 aperture, it enhances depth effect and spatial perception—enabling visually immersive shots with impressive impact.
Widescreen cinema format
With a constant 1.33x compression factor, this lens produces an impressive 2.35:1 widescreen format in 16:9 mode—while optimally utilizing the sensor for a truly immersive viewing experience.
Sensor coverage
The lens with a maximum image circle of 37 mm is ideal for S35 sensors and covers almost all full-frame cameras. However, some vignetting may occur when used on full-frame cameras.
20mm Image Circle 37mm
Image Circle 43.3mm
Fast T1.8 aperture
The fast T1.8 aperture allows more light to reach the sensor, enabling a lower ISO and a clean night scene. It also features 11 aperture blades. Even in low light conditions, you can achieve excellent images with sharp subjects, blurred backgrounds, and smooth bokeh.
Outstanding optical performance
16 lenses
in 12 groups
Cinema-quality image
Aspherical lens*1
Reduces weight and corrects chromatic aberration
Cylindrical lens*5
Controls light distribution and precisely adjusts the aspect ratio
Choose your characteristic flare style
Blue or neutral
Classic blue flare
Ideal for sci-fi, mystery, and music video scenes
Neutral flare
Adapts to light sources - for natural and warm commercial shots or portrait photography
Stunning bokeh
Unique lemon-shaped oval bokeh at wide aperture
Image with sharp subject and dreamy bokeh
Compact and lightweight
Weighing only 480 g and with a compact length of 96 mm, this lens is perfect for handheld, vehicle-mounted, or gimbal-assisted shooting.
Handheld shooting
Gimbal
Unified set design Seamless lens change
All lenses in the series have identical gear positions, a uniform 77mm filter thread, and consistent color tones. This ensures effortless lens changes, even when shooting with a gimbal, without needing to readjust accessories.
Comfortable operation
Click ON/OFF
AF/MF button
AFL button
(E/Z/L-Mount)
Stepless aperture or not
Switch between Autofocus and Manual Focus
Lock/Custom Setting
Standard Gears, 360° Focusing Range
Electronic Contacts for EXIF Transfer
Aluminum Alloy Body
Filter Size 77 mm
Firmware Update via Type-C
Native mounts: E, X, Z, L, MFT – Compatible with popular camera systems
AF Autofocus + MF Manual Focus Start your cinematic journey
Compatibility
Package Contents
1
Lens
2
Packaging Box
3
Carrying Pouch
4
Carrying Strap
5
Front Lens Cap
6
Rear Lens Cap
7
Warranty Card
Specifications
Model
20mm T1.8 1.33x Autofocus
Anamorphic cine lens
Lens format coverage
S35/APS-C
Focal length
20 mm
Maximum aperture
T1.8
Minimum aperture
T22
Lens structure
16 elements in 12 groups (including 5 lens structure cylindrical lenses and 1 aspherical lens)
Aperture diaphragm
11
Shooting distance
0.4m (1.31ft)～∞
Focusing method
Manual/Auto
Maximum magnification
1:15.4(V), 1:20.6(H)
F0V(APS-C)
38.974°(V), 73.906°(H), 78.324°(D)
Filter thread
M77*P0.75
Focusing range
360°
Max diameter
∅86.4mm/3.4inch
Diameter of the focus ring
∅86.4mm/3.4inch
Aperture ring diameter
∅80mm/3.15inch
Motor
STM
AF/MF switch
Click (ON/OFF)
AFL button
Length (mm/inch)
(without lens cap)
E: 90.95/3.58 Z: 92.95/3.66 X: 91.25/3.59
MFT: 89.75/3.53 L: 88.35/3.48
Weight (g/lb)
(without lens cap)
E: 489.3/1.08 Z: 501.1/1.1 X: 488.4/1.08
MFT: 479.5/1.06 L: 494.5/1.09

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