SIRUI IronStar 35mm T1.9 1.5x Cine Lens - PL/EF mount, Neutral Flare

The SIRUI IronStar 35mm T1.9 1.5x Cine Lens delivers full-frame coverage with a 46mm image circle ...

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Wex Photo VideoSirui IronStar 60mm T1.9 Cine Lens
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Product Information

Full details

The SIRUI IronStar 35mm T1.9 1.5x Cine Lens is designed for filmmakers seeking to achieve a distinctive widescreen cinematic look with full-frame cameras. Its key benefit is the constant 1.5x anamorphic squeeze ratio, which delivers a true 2.39:1 aspect ratio with characteristic oval bokeh and horizontal lens flares. A potential caveat is the need for compatible camera sensors and post-production workflow to fully utilize the anamorphic format. This lens offers a fast T1.9 aperture for low-light performance, advanced optical elements for clarity, minimal focus breathing, and an interchangeable mount system for broad camera compatibility.

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BrandSirui

Extended Product Information

FAQs

What is the advantage of a 1.5x anamorphic squeeze?

A 1.5x anamorphic squeeze allows you to achieve a wider aspect ratio (2.39:1) on a full-frame sensor without cropping as much as a 1.33x or spherical lens would require, while also producing characteristic oval bokeh and horizontal lens flares.

Does this lens require special post-production?

Yes, anamorphic footage needs to be 'de-squeezed' in post-production to display the correct aspect ratio and image proportions. Most editing software supports this function.

What cameras are compatible with this lens?

The lens comes with interchangeable PL and EF mounts, making it compatible with a wide range of cinema cameras and mirrorless or DSLR cameras that accept these mount types, provided they have a sensor size large enough to benefit from full-frame coverage.

How does the neutral flare affect the image?

A neutral flare means the lens produces cleaner, less pronounced flares compared to lenses with more aggressive flaring characteristics. This allows for a more natural look and greater control over lens flare during filming.

Can I use this lens for stills photography?

While designed for video, the lens can be used for stills photography. However, the anamorphic characteristics and the need for de-squeezing might be less conventional for standard still image workflows.

What is the minimum focus distance?

The minimum focus distance is not explicitly stated, but anamorphic lenses typically have a slightly longer minimum focus distance than comparable spherical lenses due to their complex optical design.

What is the benefit of the 95mm front diameter?

The 95mm front diameter is a standard size for professional cinema lenses, making it compatible with most matte boxes and filters used in filmmaking without the need for step-up rings.

Troubleshooting

Image appears stretched or distorted (not the intended anamorphic look).

Ensure you are de-squeezing the footage in your editing software or camera's preview. The lens captures a squeezed image that needs to be corrected for the final aspect ratio.

Lens does not mount securely or will not focus.

Verify that the correct mount (PL or EF) is attached and that it is compatible with your camera. Ensure the camera's mount is clean and free from obstructions. Check that the lens is fully seated in the mount.

Softness in the image, especially at the edges.

Confirm that the focus is accurately set. For anamorphic lenses, ensure you are within the optimal focus range. Check for dirt or smudges on the lens elements.

Lens gears for follow focus are not engaging properly.

Ensure that the follow focus system's gear is compatible with the 0.8 MOD standard and that it is properly meshed with the lens's focus and iris gears. Check for any obstructions.

Pros and Cons

Pros

  • Achieves true 2.39:1 widescreen aspect ratio with full-frame coverage.
  • Fast T1.9 aperture excels in low-light conditions.
  • Minimal focus breathing for professional focus pulls.
  • Versatile interchangeable mount system (PL/EF) enhances camera compatibility.
  • High-quality optics with ED, aspherical, and HRI elements for sharpness and clarity.
  • Cinema-standard design with 95mm front diameter and 0.8 MOD gears.

Cons

  • Anamorphic format requires specific post-production de-squeezing.
  • 35mm focal length can be wide for some narrative applications.
  • Anamorphic lenses can be heavier and larger than spherical counterparts.
  • While neutral, flare characteristics may not suit users seeking pronounced anamorphic streaks.
  • Requires cameras with sufficient sensor size for full-frame coverage benefits.

Setup, Compatibility & Care

Setup:

  1. Ensure your camera has a compatible mount (PL or EF, depending on the adapter used).
  2. If using an EF mount, attach it securely to the lens body. If using PL, ensure your camera is set up for PL mount.
  3. Mount the lens onto your camera body. For professional setups, use a lens support system if available.
  4. Attach any necessary accessories like a matte box or follow focus system, leveraging the 95mm front diameter and 0.8 MOD gears.
  5. When shooting, remember to de-squeeze the image in your camera's preview or in post-production software to achieve the correct aspect ratio.

Compatibility:

This lens features an interchangeable mount system, including native PL and a user-exchangeable EF mount. It is designed to cover full-frame sensors, making it compatible with cameras that offer these sensor sizes and have compatible lens mounts.

Care:

  • Handle the lens with care to avoid impacts or drops.
  • Store the lens in a protective case when not in use.
  • Use a blower brush to remove dust and debris from lens elements before wiping.
  • Clean lens elements with a microfiber lens cloth and lens cleaning solution if necessary. Avoid abrasive materials.
  • Keep lens caps on when the lens is not attached to the camera to protect the elements.
  • Protect the lens from extreme temperatures and humidity.

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