---

title: Sirui 40mm T1.8 1.33X S35 AF Anamorphic
description: "Versatile anamorphic cine lens with autofocus and 1.33x squeeze ratio for 2.35:1 cinematic look. Natural 40mm perspective with T1.8 aperture and unique hexagonal bokeh ideal for filmmaking."
brand: Sirui
mount: L-Mount
focal_length: 40
aperture: 1.8
lens_type: Prime
weight: 614
year: 2024
weather_sealed: false
image_stabilization: false
price: 599
focus: Auto
lens_category: ["Normal", "Anamorphic"]
filter_size: 77
max_magn: 0.12
close_focus: 0.60
sku: 40AF133X-L
diameter: 86
length: 95

date: 2025-09-26
draft: false
author: Jan Wedekind

featured_image: /lenses/sirui/sirui-40mm-t1-8-anamorphic.png

---

From Sirui:

> STM Motor Fast Autofocus. Advanced STM motor is added to achieve fast, accurate autofocus and eye focus, allowing you to focus on the subject during photo taking or follow the subject during video recording.
>
> 40mm All-around Focal Length - ideal for street, humanist, landscape, portrait photography, etc. Horizontally equivalent to full frame 42mm.
>
> 1.33x Squeeze Factor. The lens will produce a wide-screen aspect ratio of 2.35:1 in 16:9 shooting mode. This dynamic capability transforms your visuals into a captivating cinematic experience.
>
> Large aperture makes sure more light enters the sensor in low light situation so that it can reduce ISO and you can get a pure night scene. The 40mm produces a distinctive hexagonal elliptical bokeh when the aperture is fully open, transitioning into the signature 1.33x elliptical shape at T2.4.

[Official Website](https://store.sirui.com/products/sirui-40mm-t1-8-1-33x-s35-frame-autofocus-anamorphic-lens)

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