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

What it is and who it’s for

The SIRUI 40mm T1.8 1.33X Anamorphic Lens is a compact S35-format prime designed for Z-mount mirrorless cameras. It offers a dedicated autofocus system and a 1.33x anamorphic squeeze, aimed at creators who want a cinematic look without swapping lenses. If you’re filming on Z5, Z50, Z6/6II, Z7/7II, ZFC, Z8 or Z9, and you value a fast aperture for shallow depth of field, this lens can be a practical addition to your kit.

Autofocus and handling

Accurate Autofocus System — The lens includes an enhanced STM motor to deliver fast and precise autofocus, with support for eye detection and subject tracking. For run-and-gun shoots or solo filmmaking, that can translate into fewer missed takes and more time capturing scenes.

Visual style and flare options

Blue and Neutral Flares — Two flare options give you control over the frame’s celestial look. The 1.33x anamorphic character introduces characteristic horizontal compression and subtle streaks, bringing a cinematic, slightly dreamlike quality to your footage. It’s not an effect for every project, but it can help you stand out when the mood calls for it.

Build and practicality

Compact and Lightweight — Weighing about 614 g (1.35 lb), it’s practical for handheld or gimbal work and can slot into a smaller rig when mobility matters.

Enhanced Low-Light Performance — The T1.8 aperture improves light capture and depth of field control, which supports handheld shooting in less-than-ideal lighting and helps isolate subjects with softer backgrounds.

What it’s good at, and what it isn’t

For projects that prioritise a cinematic texture with controlled flare and a shallow depth of field, this lens offers a straightforward route to that look, especially when you want an anamorphic perspective without buying into a larger, heavier system. If you’re after ultra-wide compression or a non-anamorphic aesthetic, this lens won’t be the best fit. It’s also not a substitute for high-end manual focus work in extreme macro scenarios.

Who this is for

• Filmmakers who use Z-mount cameras and want an anamorphic look with autofocus.
• Run-and-gun shooters who benefit from a light, compact package and reliable eye-tracking focus.
• Creators seeking atmospheric flares to add character to scenes without extra post-processing.

When it makes sense to buy

• You need convenient autofocus on an anamorphic lens for S35 projects.
• You’re building a mobile setup and want a relatively light lens that still delivers cinematic depth.
• Your work can benefit from optional blue or neutral flare in the frame.

When you might want to reconsider

• If you prioritise the fastest possible manual focus control or extreme optical sharpness at very close distances, a different option might be preferable.
• If you require a more compact or heavier telephoto style, or if you’re not using Z Mount cameras, compatibility and availability of lenses may influence the decision.

What to check before buying

• Confirm that your camera supports autofocus performance you expect with this lens and that you’re comfortable with a 1.33x anamorphic squeeze on S35.
• Consider your typical shooting conditions: the T1.8 aperture helps in low light, but working with anamorphic compression changes framing dynamics and post-crop work.
• Evaluate whether you want blue or neutral flares as a creative element for your typical projects.

Practical example of use

Imagine handheld interviews or documentary scenes where you want a cinematic edge without a bulky setup. The autofocus helps keep subjects in focus as you move, while the anamorphic look adds a gentle horizontal stretch and the chosen flare can give the shot a distinctive, understated atmosphere.

FAQ

• Q: Does the lens autofocus on all Z mount cameras? A: It uses an advanced autofocus system with eye tracking, designed to work with Z-mount bodies listed in the product notes.
• Q: What kind of flare options are available? A: There are blue and neutral flare options to choose from depending on the mood you want.
• Q: How heavy is the lens? A: Approximately 614 g (1.35 lb), which is relatively light for an anamorphic S35 lens.
• Q: Is this lens suitable for low-light scenes? A: The T1.8 aperture supports better low-light performance and depth of field control compared with slower lenses.

Decision point

Is it worth it? Worth considering if you prioritise autofocus-enabled anamorphic shooting on a Z-mount system and want a balance between portability and cinematic character.