The SIRUI Astra 100 mm T1.8 brings autofocus to full-frame anamorphic filmmaking, pairing a consistent 1.33x squeeze with a fast cinema aperture. Its perspective suits close-ups, intimate dialogue and compressed telephoto compositions, and this L-Mount version has a neutral flare character.
Anamorphic framing and flare character
The constant 1.33x squeeze records a wider horizontal perspective than a spherical lens of the same focal length. When the footage is de-squeezed in post-production, it takes on an approximately 2.35:1 widescreen character from 16:9 capture, together with the elongated bokeh and visual depth associated with anamorphic optics.
Autofocus and practical cine handling
The T1.8 aperture is useful for controlled background blur and available-light scenes. An STM-driven autofocus system and AF/MF switch make the lens practical for independent productions, while cine-oriented focus and aperture controls allow more deliberate operation when needed. The neutral flare version is designed for L-Mount; minimum focus is 0.70 m.
SIRUI uses five cylindrical optical elements in the 100 mm model. Its longer focal length increases subject isolation and works well for close-up storytelling where the background should remain present but visually subdued.
Key features
- Full-frame coverage and constant 1.33x anamorphic squeeze
- 100 mm focal length for storytelling and detailed framing
- Fast T1.8 maximum aperture
- STM autofocus with AF/MF switch
- 67 mm filter thread and common cine gear positions
- Minimum focusing distance: 0.70 m
- Neutral flare rendering
- L-Mount
What's in the box
- Astra 100 mm T1.8 1.33x anamorphic cine lens
- Front and rear lens caps
- Manufacturer warranty card
