SIRUI IronStar T1.9 1.5x Cine Lens Kit 35/45/60mm (PL/EF mount, Blue Flare)

Name: SIRUI IronStar T1.9 1.5x Cine Lens Kit 35/45/60mm (PL/EF mount, Blue Flare)
Brand: Sirui
SKU: dp3ffune5c
Availability: InStock

The SIRUI IronStar T1.9 1.5x Cine Lens Kit offers full-frame coverage with a 1.5x constant squeeze...

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Sirui IronStar T1.9 1.5x Cine Lens Kit 35/45/60mm PL/EF Mount Neutral Flare

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Product Information

Full details

The SIRUI IronStar T1.9 1.5x Cine Lens Kit is designed for filmmakers seeking to achieve a distinct anamorphic look with full-frame coverage. Its primary benefit is the constant 1.5x squeeze ratio, delivering wider fields of view and characteristic oval bokeh. A potential consideration is the specific flare style (Blue in this kit) which may not suit all cinematic aesthetics. This kit includes 35mm, 45mm, and 60mm lenses, offering exceptional clarity, low light performance with a T1.9 aperture, and controlled focus breathing.

All features

Brand	Sirui

Extended Product Information

FAQs

What is the benefit of a 1.5x squeeze ratio?

A 1.5x squeeze ratio offers a wider horizontal field of view and more pronounced oval bokeh compared to lower ratios like 1.33x. It allows for cinematic aspect ratios like 2.25:1 or 2.66:1 when de-squeezed.

Can these lenses be used on Super35 cameras?

Yes, these lenses cover a 46mm image circle, which is larger than the Super35 format, ensuring full coverage without vignetting. They are also designed for full-frame coverage.

How do I change the lens mount?

The mounts are user-interchangeable. Typically, this involves loosening a few screws on the lens base, removing the existing mount, attaching the desired mount (PL or EF), and re-tightening the screws. Refer to the product manual for detailed steps.

What is the minimum focus distance for each lens?

The minimum focus distance is 0.65m for the 35mm and 45mm lenses, and 0.78m for the 60mm lens.

How do I achieve the de-squeezed aspect ratio?

In your video editing software, apply a horizontal flip or scaling adjustment with a 1.5x factor to the footage. For example, if shooting in 3:2, de-squeezing will result in a 2.25:1 aspect ratio.

Are filters compatible with these lenses?

Yes, the lenses have a 92mm filter thread and a 95mm front diameter, making them compatible with standard screw-in filters and most matte boxes.

What is the difference between the Blue Flare and Neutral Flare versions?

The Blue Flare version produces a distinct blue streak when light sources hit the lens at an angle, often used for sci-fi or dramatic looks. The Neutral Flare version produces a more traditional, less colored flare for naturalistic scenes.

Troubleshooting

Lens won't mount securely.

Ensure the correct mount (PL or EF) is installed and that it is properly aligned and tightened according to the mount-swapping instructions. Check for any debris on the camera mount or lens mount.

Image appears distorted or stretched excessively.

This is expected anamorphic behavior. Ensure the footage is being de-squeezed correctly in your editing software using the 1.5x factor. Check your software's project settings.

Focus breathing is noticeable.

While minimized, some focus breathing may still occur. For critical focus pulls, practice smooth, controlled movements and consider stopping down slightly if light permits. The design aims to reduce this significantly.

Blue flare is too strong or distracting.

If the blue flare is not desired for a particular shot, consider using flags or other light-shaping tools to control the light source hitting the lens. Alternatively, consider the Neutral Flare version of the lens if available.

Pros and Cons

Pros

Achieves a true 1.5x anamorphic look with full-frame coverage.
Excellent low-light performance due to the fast T1.9 aperture.
Advanced optical elements minimize aberrations and control focus breathing.
Versatile with interchangeable PL/EF mounts.
Consistent color and tone across the lens set.

Cons

The Blue flare might be too stylized for certain projects.
Minimum focus distances are relatively long for some applications.
Anamorphic lenses require de-squeezing in post-production.
The 1.5x squeeze may introduce more distortion than lower ratios for some users.

Setup, Compatibility & Care

Setup: The SIRUI IronStar T1.9 kit includes interchangeable PL and EF mounts. To swap mounts, typically a few screws need to be loosened on the lens body, the old mount removed, and the new mount attached. The back focus can be adjusted without disassembling the mount. Ensure the lens is firmly attached to your camera body.

Compatibility: These lenses cover a 46mm image circle, making them compatible with full-frame and larger sensors without vignetting. The kit includes 92mm filter threads and a 95mm front diameter, compatible with most standard matte boxes and filters. The included PL and EF mounts ensure compatibility with a wide range of cinema cameras.

Care: Store lenses in the provided hard case when not in use. Clean lens elements with a microfiber lens cloth. For stubborn smudges, use a lens cleaning solution sparingly on the cloth, not directly on the lens. Avoid touching the glass elements with your fingers. Keep the lens mount contacts clean.