ARRI Signature Prime 25mm T1.8 Lens (Feet)

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14.25 LBS
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Product Overview


  • Covers Large-Format Sensor Size
  • ARRI LPL LDS-2 Mount
  • Magnetic Rear Filter Holder
  • T1.8 to T22 Aperture Range
  • Matches Signature Primes & Zooms
  • 11-Blade Iris, Anti-Reflective Coatings
  • Geared Focus & Aperture Control Rings
  • Magnesium & Aluminum Construction
  • Marked in Feet
  • Light 4.2-lb Weight

Accompanying the ALEXA LF camera is the ARRI Signature Prime 25mm T1.8 Lens (Feet) fitted with the ARRI LPL mount. While the Signature Primes exemplify state-of-the-art optical precision, they have been designed to render organic, emotionally engaging images, gently softening and texturising the large format with natural skin tones and creamy bokeh. A fast T-stop of T1.8 facilitates shallow depth of field and the smooth focus fall-off gives subjects heightened presence in the frame. The ARRI Signature Prime range is the first cine lens series to feature machined magnesium lens barrels, making the optics incredibly lightweight and robust. They are also the first to incorporate ARRI’s next-generation LDS-2 Lens Data System, with high data rates and absolute encoders for fast initialising. LDS-2 extends the possibilities of lens data and is being licensed to other lens and camera manufacturers.

Large Format Coverage

  • These open standard, camera-independent lenses cover all image sensors up to full-frame, large-format with image circles up to 46mm
  • Smooth focus fall-off and a fast, maximum T1.8 aperture for shallow depth of field

Rear Filter Holder for Customized Looks

  • Create customized looks across the range of Signature Primes and Zooms using the magnetic rear filter holder
  • Quickly add nets, voile, and other materials for select scenes or for your entire shoot


The LPL mount transfers lens data via LDS-2, and is compatible with ARRI LDS-1, and Cooke /i Technology

Fast T1.8 Aperture

Part of Extensive Series

One of 16 focal lengths ranging from 12 to 280mm

Signature Prime Look

  • Each lens in the series creates the warm skin tones, crisp blacks, and soft flares of the Signature Prime look
  • Minimal chromatic aberration for easier keying in F/X work

Smooth Bokeh

An 11-blade iris produces smooth, soft, round bokeh

Minimized Internal Flare

Anti-reflective coatings, light baffles, and light traps minimize internal flare

Lighter Weight & Durable Build

  • Lightweight, compact form factor with magnesium and aluminum construction
  • Designed for easier mechanical service

Common Front Diameter

114mm front diameter across most lenses in the available set


Focal Length 25mm
Lens Mount ARRI LPL
Lens Format Coverage Large Format
Image Circle 46.0 mm
Maximum Aperture T1.8
Minimum Aperture T22
Diagonal Angle of View ARRI LF Open Gate: 84.0°
Horizontal Angle of View ARRI LF Open Gate: 73.0°
Minimum Focus Distance From Image Plane: 13.78" / 0.35 m
Diaphragm Blades 11
Gear MOD & Pitch Focus: 0.8 MOD / 32 Pitch
Iris: 0.8 MOD / 32 Pitch
Zoom: 0.8 MOD / 32 Pitch
Front Diameter 114 mm
Filter Thread None
Focus Scales Imperial
Electronic Communication Yes
Maximum Magnification Ratio 1:7.1
Image Stabilization No
Connectivity 1 x 4-Pin LEMO (Cooke /i Technology Lens Data / ARRI LDS) Data
Lens Support None
Dimensions (W x H) 4.53 x 4.53" / 115.06 x 115.06 mm
Length 7.01" / 178.05 mm
Weight 4.19 lb / 1.9 kg
Packaging Info
Package Weight 14.245 lb
Box Dimensions (LxWxH) 17 x 14.7 x 11.9"


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