Sirui 20/40mm T1.8 1.33x S35 Autofocus Anamorphic Lens

Key Features

• 37mm Image Circle Covers S35 Sensors
• Creates 2.35:1 Aspect Ratio in 16:9
• Eye-Tracking Autofocus with STM Motor
• T1.8-T22 Aperture
• Blue Anamorphic Flares
• Background Separation with Oval Bokeh
• 15.7" Minimum Focus Distance
• AF/MF Select and AF-Lock Buttons
• Compact, Lightweight Form Factor
• Sony E-Mount | 77mm Front Filter Thread

Sirui 20mm T1.8 Anamorphic AF Overview

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-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 both independent creators and professional productions.

Anamorphic Aesthetic

1.33x squeeze factor for 2.35:1 images in 16:9 mode

Unique oval bokeh enhances subject separation and depth

Horizontal field of view equivalent to 22mm full-frame lens

Blue 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 reliable subject tracking

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-mount cameras

Standard 77mm front filter thread

Update lens firmware via female UCB-C port

In the Box

• Sirui 20mm T1.8 1.33x S35 AF Anamorphic Lens (Sony E, Blue Flares)
• Carrying Pouch
• Carrying Strap
• Front Lens Cap
• Back Lens Cap
• Limited 18-Month Manufacturer Warranty

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