Sirui Astra Series 50/75/100mm T1.8 Full-frame AF Anamorphic Cine Lens Kit - L Mount, Neutral Flare

Name: Sirui Astra Series 50/75/100mm T1.8 Full-frame AF Anamorphic Cine Lens Kit - L Mount, Neutral Flare
Brand: Sirui
SKU: 4zgpkft47g
Availability: InStock

The Sirui Astra Series 50mm, 75mm and 100mm T1.8 is a full-frame anamorphic cine lens kit built ar...

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Sirui Cine Lens Kit - Full-frame Anamorphic - 50/75/100mm T1.8 - L Mount

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Wex Photo VideoSirui Cine Lens Kit - Full-frame Anamorphic - 50/75/100mm T1.8 - L Mount

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Product Information

Full details

The Sirui Astra Series T1.8 anamorphic cine lens kit (available in 50mm, 75mm, and 100mm focal lengths) is designed for full-frame mirrorless cameras, offering a constant 1.33x squeeze ratio to achieve a 2.4:1 widescreen cinematic look from a 16:9 capture without cropping. Key features include fast autofocus, a T1.8 aperture for low-light performance and shallow depth of field, and consistent color rendition across the set. While it democratizes the anamorphic look with autofocus for solo operators, users should be aware of the specific flare characteristics (blue or neutral) that influence the final aesthetic.

All features

Brand	Sirui

Extended Product Information

FAQs

What does the 1.33x squeeze ratio mean?

The 1.33x squeeze ratio means that the lens horizontally compresses the image by a factor of 1.33. When you de-squeeze the footage in post-production (typically by stretching it horizontally by 33%), you achieve a 2.4:1 widescreen aspect ratio from standard 16:9 sensor footage, creating a cinematic look with oval bokeh and horizontal light flares.

Can I use these lenses on APS-C cameras?

Yes, these full-frame lenses can be used on APS-C and Super 35 cameras. However, the image circle will not cover the entire sensor, resulting in a cropped image. The effective focal length will also be multiplied by the camera's crop factor (e.g., a 50mm lens on an APS-C camera with a 1.5x crop factor will behave like a 75mm lens).

How do I choose between the blue flare and neutral flare versions?

The blue flare version produces distinct horizontal blue streaks when light sources hit the lens at an angle, commonly associated with sci-fi or futuristic aesthetics. The neutral flare version produces a more generalized flare that mimics classic anamorphic looks without the strong blue tint, suitable for a wider range of genres like dramas or documentaries.

What is the difference between T1.8 and f/1.8?

T-stop (Transmitted light stop) is a more accurate measure of light transmission than f-stop (focal ratio). T1.8 indicates the actual amount of light passing through the lens to the sensor, which is crucial for consistent exposure in video. f/1.8 is a theoretical calculation of aperture size.

How does the autofocus work on these anamorphic lenses?

The lenses feature a built-in STM autofocus motor that allows for quick and precise focusing. This system is particularly beneficial for solo operators as it removes the need for a manual focus puller, enhancing shooting efficiency and enabling smoother focus transitions.

What is the warranty period for the Sirui Astra Series lenses?

Sirui offers a free replacement within 3 years for non-human-induced damage with a valid proof of purchase. They also provide a lifetime paid repair service for human-induced damage. Please refer to the warranty card for full details.

Are the gear positions for focus and aperture the same across all focal lengths?

Yes, the gear positions for the focus and aperture rings are identical across the 50mm, 75mm, and 100mm lenses in the Astra Series. This uniformity simplifies the use of follow focus systems and other accessories when switching between lenses during a shoot.

Troubleshooting

Autofocus is slow or hunting

Ensure the lens firmware is up-to-date (if applicable via camera body). Clean the lens contacts and camera mount contacts. Try manual focus for critical shots. Test in well-lit conditions.

Image appears soft or out of focus

Verify that the lens is securely mounted. Check the focus setting (AF or MF) and ensure it's appropriate for the scene. Confirm the correct focal length is selected and that you are within the lens's focus range. Clean the lens elements.

Lens won't communicate with the camera (no aperture control, EXIF data missing)

Clean the electronic contacts on both the lens and the camera mount. Ensure the lens is fully seated. Check camera settings for lens communication options. Try a different compatible lens to rule out camera issues.

Visible flare or chromatic aberration in unwanted areas

Use the included lens hood to block stray light. Adjust lighting conditions if possible. Be mindful of the selected flare type (blue vs. neutral) and its impact on the scene. Shoot at a slightly smaller aperture if flare is distracting.

Pros and Cons

Pros

Enables a true 2.4:1 widescreen cinematic look from standard 16:9 footage.
Autofocus capability significantly increases shooting efficiency, especially for single operators.
T1.8 aperture provides excellent low-light capability and beautiful bokeh.
Consistent color and contrast across the 50mm, 75mm, and 100mm focal lengths.
Choice between blue and neutral flare options for creative control.
Robust build quality suitable for professional use.

Cons

Autofocus performance may vary depending on camera body and lighting conditions.
Anamorphic distortion and focus breathing, while managed, are inherent characteristics.
Requires post-production de-squeezing to achieve the final widescreen image.
The specific flare characteristics may not suit every project's aesthetic.

Setup, Compatibility & Care

Mounting: The Sirui Astra Series lenses are available for E, L, and Z mounts. Simply align the lens with the camera's mount index and twist until it clicks into place. Ensure your camera body is compatible with the chosen lens mount.

Autofocus/Manual Focus: Use the AF/MF switch on the lens to toggle between autofocus and manual focus modes. For manual focus, the focus ring offers a smooth 136° throw with distance markings. Compatibility with LiDAR follow-focus systems is supported for enhanced manual control.

Aperture Control: The aperture ring features a click/unclick switch for stepped or stepless adjustments, allowing for smooth iris changes during video recording. Set to 'A' for automatic aperture control via the camera body.

Compatibility: These lenses are designed for full-frame mirrorless cameras. Ensure your specific camera model is listed for full compatibility. While many APS-C and Super 35 cameras can use these lenses, the image circle will be smaller, and the effective focal length will be cropped.

Care:

Cleaning: Use a soft, dry microfiber cloth to clean the lens elements. For stubborn smudges, use a lens cleaning solution sparingly on the cloth.
Storage: Store lenses in their protective cases or a padded camera bag to protect them from dust, moisture, and impact.
Protection: The lenses offer dustproof, stain-resistant, and rain-resistant properties, but avoid prolonged exposure to harsh weather conditions. Use a lens hood when necessary to reduce flare and protect the front element.