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Rent NowThe Sirui Astra Series T1.8 1.33x 50mm Full-Frame Anamorphic Lens (Sony E, Neutral Flares) is a full-frame cinema prime holding the distinction of being the world’s first full-frame anamorphic lens to combine a constant T1.8 aperture with fast autofocus across the entire range. Designed for Sony E-mount full-frame mirrorless cameras, it’s well suited to narrative films, music videos, commercials, and other projects that benefit from a widescreen cinematic aspect ratio.
With a 1.33x anamorphic squeeze ratio, the lens directly restores the classic 2.4:1 widescreen cinematic look on a standard 16:9 sensor, without cropping or pixel loss, delivering a high-resolution, immersive image along with the characteristic oval bokeh, vertical background stretch, and horizontal lens flares that define the anamorphic look (this version produces neutral-colored streak flares, as opposed to the blue-flare variant also offered). The lens covers a 44mm image circle, ensuring edge-to-edge sharpness and full-frame coverage without vignetting.
Optically, the lens is built from 18 elements in 14 groups, including four cylindrical lenses and one aspherical lens, delivering strong image quality across the frame at a maximum aperture of T1.8, narrowing to a minimum of T22. The bright aperture provides ample light even in low-light or night scenes for clean, high-quality images, along with shallow depth of field for soft bokeh and natural subject separation. An 11-blade aperture diaphragm contributes to the lens’s smooth, cinematic rendering. The lens delivers a full-frame field of view of 27.8° (vertical), 56.8° (horizontal), and 60.9° (diagonal).
Autofocus is handled by a silent STM motor, with full manual override available via an AF/MF switch, along with an AF lock (FN) button, an iris lock, and a selectable clicked or de-clicked aperture ring, giving filmmakers precise, tactile control. A built-in focus distance scale and LiDAR autofocus compatibility support consistent focus tracking for professional workflows. The lens has a minimum focusing distance of 1.6 ft. (0.5m) from the front of the lens, with a focus ring rotation angle of 136 degrees.
Build quality uses an aluminum alloy lens body with triple protection against dust, dirt, and raindrops, making it durable for professional field use. The lens accepts a 67mm filter thread, measures 72mm in outer diameter by approximately 5.2 in. (131mm) in length (excluding lens caps), and weighs approximately 1.37 lb (620g). It’s part of a matched three-lens set (50mm, 75mm, and 100mm) sharing consistent color, tone, and physical size for fast lens swapping and simplified gimbal rebalancing.
Key Features
– 50mm T1.8 full-frame autofocus anamorphic cine lens for Sony E-mount
– World’s first full-frame anamorphic lens combining T1.8 constant aperture with autofocus
– 1.33x anamorphic squeeze (restores 2.4:1 widescreen aspect ratio on 16:9 sensors)
– 44mm image circle (full-frame coverage, no vignetting)
– 18 elements in 14 groups, including 4 cylindrical and 1 aspherical lens
– 11-blade aperture diaphragm
– Neutral-colored streak flares
– Silent STM autofocus motor with AF/MF switch
– AF lock (FN) button, iris lock, and clicked/de-clicked aperture ring
– Focus distance scale and LiDAR autofocus compatibility
– Minimum focusing distance of 1.6 ft. (0.5m)
– Aluminum alloy construction with dust, dirt, and raindrop protection
– 67mm filter thread
– Approximate weight: 620g (1.37 lb)
– Matched optical/physical design across 50mm, 75mm, and 100mm set
– Compatible with Sony full-frame E-mount cameras
