Sirui Jupiter ZM-EF 28-85mm T3.2 Full-Frame Cine Lens — main product image

Sirui Jupiter ZM-EF 28-85mm T3.2 Full-Frame Cine Lens

Sirui

Sirui Jupiter ZM-EF 28-85mm T3.2 Full-Frame Cine Lens

Name: Sirui Jupiter ZM-EF 28-85mm T3.2 Full-Frame Cine Lens
Brand: Sirui
SKU: Jupiter ZM-EF

★★★★★4.5 (2 reviews)

A parfocal 28-85mm T3.2 cine zoom with 259° focus throw and 11-blade aperture — the Sirui Jupiter covers your entire narrative shooting range in a single, focus-mark-accurate package.

$1,194.64*$1,499.00Save 20%

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Sirui Jupiter ZM-EF is a full-frame parfocal cine zoom covering 28mm to 85mm at a constant T3.2 maximum aperture — a range and aperture combination designed to serve as a single-lens solution for narrative filmmaking across wide, normal, and medium-telephoto coverage. The 22-element, 18-group optical formula is built to resolve 8K-level detail while maintaining the controlled chromatic aberration and focus breathing behavior that separates cinema lenses from photo lenses adapted for video use. The step-less aperture with T-stop marks is a functional distinction: T-stops reflect actual light transmission, not theoretical geometry, enabling two Jupiter lenses on two cameras to expose identically at the same T-stop without matching corrections in post.

The 259° focus ring throw is the specification that focus pullers will notice most immediately in practice. That degree of rotation translates to fine mechanical resolution across the focus range — the difference between a two-meter subject distance and a three-meter subject distance represents significant physical ring travel, giving the AC the sensitivity to execute smooth, frame-accurate pulls during dialogue scenes. The 11-blade aperture produces circular bokeh across the entire T-stop range, maintaining the cinema aesthetic that separates this from iris designs with polygonal out-of-focus rendering. At 2.536 kg in an all-metal body, the Jupiter is a proper cinema lens in weight and build — paired with the included PP alloy hard case, it is built for the repetition and conditions of a working production schedule, not occasional use.

Key Features

【3X Zoom Ratio】This cine lens covers a very practical zoom range from wide-angle to medium telephoto (28mm to 85mm), which allows filmmakers to go out for filming all in one package. This zoom lens features advanced parfocal design, which allows the focus remains unchanged throughout the zoom range, so the story will be consistent and attractive.

【8K Resolution】The image is exceptionally sharp and the overall look is crystal clear. The transition is smooth and natural with some pleasing bokeh in the background. Minimal Focus breathing is unnoticeable especially when you have a moving subject or the camera panning, effectively keeping your audience from distracting.

【Step-less Control】An aperture range of T3.2 to T22 is offered for precise exposure control. The lens features a step-less aperture ring and a long focus throw of 259° for accurate and smooth iris adjustment and focus pulling. The focus ring features a dual scale with both feet and meters, making this lens super nice to operate and use.

【Ingenuity In Details】Weighs only 2.5kg with an all-metal body, this lens looks super solid and premium. It comes with a custom hard case with PP alloy construction, providing optimal protection for the lens against extreme temperatures, water, dust, etc.

Specifications

Focal Length

28–85mm

Maximum Aperture

T3.2

Minimum Aperture

T22

Aperture Blades

Lens Structure

22 elements in 18 groups

Minimum Focus Distance

2.3 ft (0.7m)

Focus Ring Rotation

259°

Mount

Front Diameter

114mm / 4.49 in

Weight

2.536 kg / 5.59 lbs

Length

223mm / 8.78 in

Parfocal

Yes

Pros & Cons

👍 Pros

Parfocal design maintains focus through the full 28-85mm zoom range, enabling focus-then-zoom composition technique and smooth in-camera zoom moves without refocus
259° focus ring rotation provides the precise mechanical resolution that professional focus pullers require for accurate, smooth focus transitions during narrative dialogue and movement scenes
Step-less aperture ring with T-stop markings enables clean in-scene iris pulls and matched exposure across multi-camera setups with no on-camera click noise
11-blade aperture produces circular bokeh and smooth out-of-focus transitions throughout the T3.2–T22 range, consistent with professional cinema lens aesthetic standards
Custom hard-shell PP alloy case provides genuine protection against extreme temperature, water, and dust — appropriate for a lens that travels between location and stage environments regularly

👎 Cons

At 2.536 kg (5.59 lbs), the Jupiter demands deliberate counterbalancing on gimbals and shoulder rigs — lighter cine zoom alternatives exist for run-and-gun documentary workflows where weight is a critical constraint
T3.2 maximum aperture is slower than the T1.5–T2.0 available from prime sets — in low-light narrative environments, this may require supplemental lighting where faster lenses could shoot available light
EF mount only — mirrorless camera operators on Sony E, Arri LPL, or PL mount systems require additional mount adapters, which can introduce play and affect parfocal stability
Manual-focus-only design requires a dedicated focus puller for professional narrative work; solo operators shooting without an AC will find accurate focus pulling under T3.2 at distance challenging
223mm (8.78-inch) body length occupies significant cage space and affects camera balance forward — rigs must be configured to compensate for the front-heavy weight distribution

Frequently Asked Questions

What does "parfocal" mean on this lens, and why does it matter during a film shoot?

Parfocal means the focus point remains constant as you zoom — if you focus at 85mm and then zoom out to 28mm, your subject stays in focus throughout the zoom move. This is critical for filmmakers: zooming in to focus tightly, then zooming back to your intended composition, is a standard first-AC technique. A non-parfocal lens (most photo zoom lenses) requires refocus after every zoom change, making in-camera zoom shots and focus pulls significantly more complex.

What is the T-stop aperture rating, and how does T3.2 differ from an f/3.2 rating?

T-stops measure the actual light transmission through the lens — accounting for light lost to absorption and reflection within the optical formula — while f-stops are purely geometric calculations. A T3.2 rating means the lens actually transmits T3.2-equivalent light, not approximately that amount. This matters on set: two lenses rated T3.2 will expose identically, enabling matched coverage across multiple camera units without exposure correction in post.

What is the focus ring's rotation angle and why does a 259° throw matter?

The focus ring travels 259° from minimum focus distance to infinity. A longer throw gives the focus puller finer mechanical resolution per degree of rotation — at 259°, the difference between 1m and 2m subject distance represents many degrees of ring travel rather than the 30–60° of a typical photo lens. This directly improves the accuracy of focus pulls during dialogue scenes and slow-moving subject tracking.

Does the step-less aperture ring allow for smooth iris pulls in video?

Yes — the step-less (de-clicked) aperture ring allows continuous smooth aperture adjustment without the click stops that create audible clicks on-camera microphones and visible exposure steps in video. This enables in-scene iris pulls for exposure adjustment during a take — a standard narrative filmmaking technique that clicked photo lenses physically cannot perform cleanly.

What is the lens weight and how does that affect rig balance?

The Sirui Jupiter weighs 2.536 kg (5.59 lbs). This is a substantial lens — heavier than most photo lenses and comparable to professional cinema prime sets. On a shoulder rig or gimbel, this weight requires deliberate counterbalancing. The all-metal construction contributes to this weight; the trade-off is build rigidity and thermal stability during long shooting days.