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ARRI Signature Prime 125mm T1.8 (Imperial Measurements) Lens

The ARRI 125mm T1.8 is a 125mm f/1.8 cinema lens designed for LPL mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

ARRI Signature Prime 125mm T1.8 (Imperial Measurements) Lens

ARRI Signature Prime 125mm T1.8 (Imperial Measurements) Lens

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Lens Overview — ARRI 125mm T1.8

The ARRI Signature Prime 125mm is a fixed focal length cinema lens built for large format coverage, making it a strong choice for productions working with full-frame and large-format digital cinema cameras. Mounted on the PL Mount, this lens is designed squarely for the Cinema / Video camera ecosystem, and its manual focus operation places full control in the hands of a skilled focus puller. At a maximum aperture of T1.8, it offers strong light-gathering capability that opens up shooting options in lower light conditions and enables a shallower depth of field for subject isolation.

Weighing 2.31kg, it sits in a range that is manageable for handheld or gimbal rigs, though operators should account for that mass in longer shooting days. As a prime lens with a 125mm focal length, it occupies telephoto territory, well suited to portrait-style framing, close-up character work, and scenes where compression of the background is a creative goal. The lens carries no image stabilization, which is standard practice for cinema glass of this caliber where rigs and fluid heads handle stability.

With no autofocus system, it is built entirely around manual operation, consistent with professional cinema production workflows where repeatability and precision are essential.

Key Features — ARRI 125mm T1.8

125mm Prime Focal Length: Fixed telephoto focal length ideal for portrait framing, close-up character work, and background compression.

T1.8 Maximum Aperture: Wide maximum aperture supports shooting in lower light conditions and allows for a shallow depth of field with strong subject isolation.

Large Format Coverage: Designed to cover full-frame and large-format cinema sensors, making it compatible with cameras such as the ARRI ALEXA LF and ALEXA 65.

LPL Mount: The ARRI Signature Prime 125mm uses the LPL (Large Positive Lock) mount, ARRI's large-format cinema mount, not the standard PL mount.

Manual Focus Design: Smooth, precise manual focus ring built for repeatable, accurate focus pulls in professional cinema workflows.

Signature Optical Character: Part of ARRI's Signature Prime series, engineered to render a distinct, organic look with smooth bokeh transitions and controlled flare behavior.

Lens Specifications — ARRI 125mm T1.8

ARRI 125mm T1.8 full specifications
SpecDetail
Use CasesStudio, Video / Cinematography
Lens TypeCine
FormatFull Frame
Zoom/PrimePrime
Focal Length125mm
Maximum Aperturef/1.8
Camera SystemCinema / Video
Lens MountLPL
AutofocusNo
Focus TypeManual
Image StabilizationNone
Weight2.31kg

Description — ARRI 125mm T1.8

The ARRI Signature Prime 125mm is a prime cinema lens designed for large format coverage and built around a PL Mount connection. It operates within the Cinema / Video camera system and is intended for professional productions that demand consistent, repeatable optics across a controlled set environment. With a maximum aperture of T1.8, this lens allows for strong light collection and the ability to work in more demanding lighting conditions while also supporting a shallow depth of field that helps separate subjects from their backgrounds.

At 125mm, it sits in telephoto territory, making it particularly well suited to portraiture, close character work, and scenes where background compression serves the visual story. Focus is entirely manual, placing control with a skilled focus puller rather than any electronic system. The lens weighs 2.31kg, which is a meaningful but manageable figure for large format cinema glass when used with properly balanced rigs.

There is no image stabilization, consistent with industry norms for cinema lenses where external support systems handle motion control. No filter thread size is listed in the specifications, so buyers should verify front filtration compatibility before purchase.

Pros — ARRI 125mm T1.8

  • ✓Wide maximum aperture of T1.8 enables shooting in lower light and supports shallower depth of field
  • ✓Large format coverage suits full-frame and large-format cinema sensors via PL Mount
  • ✓Prime design at 125mm provides a consistent telephoto focal length with no zoom variability

Cons — ARRI 125mm T1.8

  • ✗No image stabilization, requiring external support systems for stable handheld or moving shots
  • ✗Manual focus only with no autofocus capability, demanding a dedicated focus puller on set
  • ✗No filter thread size listed, which may complicate front-of-lens filtration options

Resources & Downloads — ARRI 125mm T1.8

Manuals & Guides

Frequently Asked Questions — ARRI 125mm T1.8

What camera mount does the ARRI Signature Prime 125mm use?+
This lens uses a PL Mount, which is a standard mount in professional cinema production. It is listed under the Cinema / Video camera system, so buyers should confirm PL Mount compatibility with their specific camera body or adapter setup.
Does this lens support autofocus?+
No, this lens is manual focus only with no autofocus capability. It is designed for cinema production workflows where a dedicated focus puller operates focus pulls with precision and repeatability.
What sensor formats does the ARRI Signature Prime 125mm cover?+
The lens is specified as Large Format, meaning it is designed to cover large format and full-frame cinema sensors. Buyers working with smaller sensor cameras will find this lens fully usable, though the large format image circle provides headroom for larger sensors.
What is the maximum aperture of this lens?+
The maximum aperture is T1.8. This is a T-stop rating, which measures actual light transmission rather than the theoretical f-stop value, making it a reliable figure for cinema exposure calculations.
How heavy is the ARRI Signature Prime 125mm?+
The lens weighs 2.31kg. Operators building out rigs, gimbals, or shoulder mounts should account for this weight alongside the camera body and any additional accessories.
Does this lens have image stabilization?+
No, this lens has no image stabilization. For cinema production, stabilization is typically handled by fluid head tripods, camera rigs, or gimbal systems rather than in-lens optical stabilization.

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