SIRUI 20mm T1.8 1.33X Anamorphic Lens for E‑mount

This 20mm anamorphic lens from Sirui brings a widescreen cinematic look to Super 35 and APS-C cameras, combining a fast T1.8 aperture with selectable autofocus for run-and-gun shooting and deliberate manual control. It widens perspective for landscapes, interiors and creative narrative work while offering the characteristic blue flare option for stylised highlights.

Key Points

The lens produces a 1.33x anamorphic squeeze that yields an approximate 2.35:1 widescreen image when filmed in 16:9, creating an immersive cinema aspect without cropping. It features a fast T1.8 aperture that helps in low light and gives pronounced subject separation with smooth bokeh. Autofocus is powered by a stepper motor (STM) for quiet and precise operation, and there is a switch to select AF or MF plus an AF lock for consistent results during takes. Two flare styles, blue and neutral, allow creative choices for mood and highlight character. The optical circle of 37 mm is tuned for Super 35 / APS-C sensors, giving sharp coverage across the frame. At about 480 g the lens remains compact and lightweight for handheld, gimbal and run-and-gun setups.

Technical Specifications

• Name: Sirui 20mm T1.8 1.33X Anamorphic Lens (blue flare)
• Mount: E mount compatible with Sony A6400, A6700, FX3/30, ZV-E series, A7 series and A9/9II (where format/crop applies)
• Anamorphic factor: 1.33x
• Aperture: T1.8
• Image circle: 37 mm (Super 35 / APS-C coverage)
• Weight: 480 g

Benefits

Using an anamorphic squeeze gives a wider cinematic frame while preserving vertical resolution, which makes it easier to deliver that filmic 2.35:1 look directly in-camera. The T1.8 aperture reduces the need for high ISO in dim interiors or night scenes and supports a shallow depth of field for subject isolation. The selectable autofocus driven by the STM is helpful for hybrid shooters who need quick, reliable focus when moving between AF and manual focusing. The two distinct flare options let cinematographers fine tune the mood, either keeping highlights more neutral or adding the classic blue flare for a vintage cinematic touch.

Usage Recommendations

Mount this lens on an E-mount body set to Super 35 or APS-C mode to match the intended coverage and avoid unexpected vignetting on full-frame sensors. For controlled focus pulls use the AF lock or switch to manual focus for precise craftsman-style pulls. Consider stopping down slightly for maximum edge-to-edge sharpness in wide landscape shots, and open to T1.8 when you want cleaner low-light performance and pronounced subject separation. Bear in mind that the 1.33x squeeze changes horizontal composition, so frame with the anamorphic effect in mind when planning shots.