Overview
The Sirui 35mm F1.8 1.33x Anamorphic is a manual focus anamorphic cinema lens from Chinese manufacturer Sirui. It belongs to the affordable 1.33x Anamorphic series, through which Sirui has made anamorphic optics accessible to smaller productions and hobbyist filmmakers. The lens horizontally compresses the image by a factor of 1.33x: when shooting with a 16:9 sensor, a cinematic aspect ratio of approximately 2.4:1 is achieved after de-squeezing. Characteristic features are the blue streak flares (lens flares) typical of anamorphic optics, as well as oval bokeh highlights in the out-of-focus areas.
The lens is designed for the Super35 or APS-C image circle; an identical variant exists for the smaller MFT format (Micro Four Thirds). Focus and aperture are set manually – this older 35mm version does not have an autofocus function.
Technical Specifications
| Parameter | Value |
|---|
| Focal Length | 35 mm |
| Anamorphic Squeeze Factor | 1.33x |
| Aperture / Aperture Range | f/1.8 to f/16 |
| Image Circle | Super35 / APS-C (also MFT variant) |
| Optical Construction | 13 elements in 9 groups |
| Diaphragm Blades | 10 |
| Filter Thread | 67 mm |
| Minimum Focusing Distance | approx. 0.85 m |
| Weight | approx. 700 g |
| Length | approx. 117 mm |
| Focusing | manual |
The lens is available in several native mounts (including MFT, Leica L, Canon RF) as well as for Sony E, Canon EF-M, and Nikon Z.
On-Set Usage
The lens is primarily used for narrative short films, music videos, and corporate films where an anamorphic look is desired on a small budget. In post-production, the compressed footage must be de-squeezed (1.33x de-squeeze) to ensure correct proportions and the widescreen aspect ratio; many editing programs and cameras offer a corresponding preset for this.
Since focus and aperture operate purely mechanically, the lens is suitable for controlled work with a follow focus and matte box. However, the comparatively large minimum focusing distance of around 0.85 m limits very close shots of small objects – an achromatic attachment lens (diopter) is usually required for tight inserts. The pronounced blue horizontal flares can be deliberately provoked by direct or side light sources in the frame and are an essential stylistic element of the anamorphic look.