SIRUI IronStar 45mm T1.9 1.5x Cine Lens - PL/EF mount - Neutral Flare

A 1.5x squeeze ratio means that the anamorphic lens compresses the image horizontally by 1.5 times onto the sensor. In post-production, this image is de-squeezed by 1.5 times to achieve a wider aspect ratio than a standard spherical lens would provide.

Yes, the SIRUI IronStar 45mm T1.9 lens features 0.8 MOD focus and iris gears, which are standard for cinema accessories like follow focus systems.

While the lens provides full-frame coverage, it can also be used on crop sensor cameras. However, the resulting field of view will be narrower, and the anamorphic effect will be different depending on the sensor's crop factor.

Neutral flare lenses produce cleaner, more natural light streaks and blooms when hit by light sources. Blue flare lenses typically produce more pronounced, often blue-tinted flares, which can add a stylized look but may be more distracting for some applications.

Focus breathing is the change in the lens's field of view that occurs when adjusting the focus. Minimal focus breathing means the image frame size changes very little during focus adjustments, which is desirable for professional cinematography.

The minimum focusing distance for this lens is not specified in the provided information. Please consult the official SIRUI product documentation for precise specifications.

The lens features a 95mm front diameter, which is standard for professional cine lenses and typically used for matte boxes or clamp-on filters, rather than a direct screw-in filter thread.

This is expected. The footage needs to be de-squeezed in post-production using editing software that supports anamorphic footage. Apply the appropriate de-squeeze factor (1.5x for this lens).

Ensure the focus ring is clean and free of debris. Check that the internal gears are not obstructed. If the issue persists, it may require professional servicing.

Verify that you are using the correct mount (PL or EF) for your camera and that it is properly aligned and securely fastened according to the manual's instructions.

Confirm the lens is clean and free of dust or smudges on the elements. Ensure the focus is accurately set for the subject distance. Check for focus breathing if the focus was adjusted during the shot.