SIRUI 40mm T1.8 1.33X Anamorphic Lens for Sony E-Mount (S35) with Autofocus

What it is and what problem it solves

The SIRUI 40mm T1.8 1.33X Anamorphic Lens is a compact, lightweight option designed for Sony E-mount cameras with a Super 35 format. It brings the distinctive cinematic look of 1.33x anamorphic capture, while offering autofocus powered by an advanced STM mechanism. For videographers and hybrid shooters who want a more cinematic character without lugging heavy glass, this lens aims to deliver a fast T1.8 aperture, reliable eye and subject tracking, and a controlled depth of field. On paper, its autofocus is meant to streamline run-and-gun shooting and keep subjects sharp as you move through a scene.

How it works in practice

The autofocus system uses an STM motor to balance speed and precision. If you’ve shot with manual focus anamorphics before, you’ll notice the potential convenience of autofocus when framing quick actions or interviews. The lens also supports eye detection and subject tracking, which helps maintain focus on people as they move within the frame. The 1.33x squeeze should produce the horizontal flares and slightly elongated bokeh associated with anamorphic lenses, contributing to a cinematic aesthetic without needing to switch to full custom anamorphic rigs.

Design and handling: what stands out

Weighing in at around 614 g (1.35 lb), the lens is aimed at mobile setups, gimbals, and “run-and-gun” shoots where space and weight matter. The T1.8 maximum aperture promises improved low-light performance and more pronounced background separation than standard APS-C lenses, potentially letting you shoot in dim interiors or at dusk with natural light. The optical package is described to offer blue or neutral flares, giving you a choice in the character of the flare streaks a scene can exhibit.

Pros: what’s compelling on paper

• Autofocus with eye detection and subject tracking can save time on dynamic scenes.
• 1.33x anamorphic look offers a cinematic feel without extra rigging.
• Lightweight and compact for on-the-go shooting.
• Strong low-light potential thanks to T1.8.
• Dual flare options give creative control over the frame’s mood.

Cons: where it might fall short

• Autofocus performance with anamorphic distortions and extreme motion can still depend on subject speed and lighting, manual focus may sometimes be preferable for precise framing.
• As a dedicated S35 anamorphic, it won’t produce a full 4K or 6K anamorphic look without post-processing or other optics, so expectations should be aligned with a specific cinematic style.
• Weight and balance could affect rigs with smaller bodies or lightweight cages, a proper setup is worth considering.

Who it’s for

• Solo filmmakers and reporters who want a cinematic vibe without heavier rigs.
• Creators using Sony E-mount bodies in the X-to-S35 range looking for autofocus alongside an anamorphic character.
• On-location shooters who value portability with a recognisable anamorphic flare aesthetic.

Who it isn’t ideal for

• If you prioritise perfectly predictable autofocus over creative focus pulls, or if you require flawless magnification at macro distances, you might prefer a standard modern prime.
• If you’re after a neutral, non-anamorphic look, this lens introduces the characteristic flare and squeeze, which may not suit every project.

When it makes sense to buy

• You’re building a light, mobile kit and want a distinctly cinematic look from an affordable anamorphic option.
• Your projects feature running-and-gun interviews or event coverage where autofocus and tracking help maintain focus with minimal setup.
• You routinely shoot in low light and want a fast aperture to unlock shallow depth of field without artificial lighting.

What to check before buying

• Compatibility: confirm your camera body supports AF with this lens and that the chosen body can leverage eye detection and subject tracking.
• Rig balance: ensure your rig can handle the 614 g weight without affecting balance on gimbals or sliders.
• Creative control: decide if you want blue or neutral flares and how the anamorphic look integrates with your grading workflow.
• Access to maintenance and service: ensure support for service in the UK market if you rely on the glass for ongoing productions.

Practical use: a typical setup

Imagine a quick interview at golden hour: you mount the lens on a Sony E-mount body, frame the subject, and let the autofocus chase the eye as they speak. The 1.33x squeeze will give you the signature horizontal flare when light hits a strong source, but with the two flare options, you can choose a subtler or more obvious look according to mood. In a run-and-gun scene with moving subjects, the combination of T1.8 and autofocus can help you maintain subject sharpness without constant manual focus tweaks, freeing you to concentrate on composition and storytelling.

FAQ

• Does autofocus guarantee perfect sharpness in all situations? Not always, lighting, subject speed and lens alignment can still influence focus accuracy.
• Can I rely on this lens for landscape work? It’s designed more for narrative visuals and selective focus, where anamorphic distortion is part of the aesthetic.
• Is the camera’s existing AF system compatible with eye tracking? This varies by body and firmware, check your camera’s autofocus capabilities with this lens before purchase.

Is it worth it?

A solid pick if you’re seeking a compact anamorphic option with autofocus that’s aimed at on-the-go filmmaking. It makes sense if you prioritise mobility, cinematic flares, and a fast aperture for low light. If you’re after pristine autofocus in every frame or a completely neutral look, you may want to evaluate alternatives.

Final verdict

This lens can fill a niche for shooters who want cinema-style visuals with practical autofocus support on Sony E-mount bodies. It’s not perfect for every scenario, but it provides a credible balance between portability, speed, and a recognisable anamorphic character. If your projects benefit from the 1.33x anamorphic look and you’re shooting with compatible Sony bodies, it’s worth considering.

Quick FAQ (at a glance)

• Will it autofocus with all E-mount bodies? Autofocus features depend on camera compatibility and firmware, verify your model supports eye detection and subject tracking with this lens.
• How noticeable are the flares? The lens offers blue or neutral flare options, which affect the framing mood but aren’t automatic every shot.
• Is it suitable for handheld documentary work? Yes, its light weight and autofocus can help in dynamic, mobile shoots, but plan for stabilization and framing versatility.