Arri KK.0019193 - ARRI Signature Prime 21/T1.8 METRIC



SP21/T1.8M - front diameter: Ø 114mm. Delivered in case

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23 408,00 CHF


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Arri Signature Prime 21/T1.8 Metric

Accompanying the ALEXA LF camera are 16 large-format ARRI Signature Prime lenses, ranging from 12 mm to 280 mm and 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 texturizing 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 initializing. LDS-2 extends the possibilities of lens data and is being licensed to other lens and camera manufacturers.

Although the camera, lens mount and lenses are new, full compatibility with existing PL mount lenses and ALEXA accessories is a cornerstone of the system's design. A PL-to-LPL adapter offers backwards compatibility with all PL mount lenses, be they Super 35 or full frame. The adapter attaches securely to the LPL lens mount without tools, allowing crews to rapidly switch between PL and LPL lenses on set. Cinematographers are therefore offered an unlimited lens choice, with complete lens metadata accessible from LDS-2, LDS-1 or /i lenses.

For even further cross-system compatibility, an LPL lens mount can be fitted to existing ALEXA, ALEXA Mini and AMIRA cameras. ARRI Signature Primes and other future LPL mount lenses can therefore be used for both Super 35 and large format on productions combining the two.


- 21 mm fixed focal length

- T-Stop - T1.8

- Meter scale





Lens Mount


MOD from sensor plane (minimum marked distance)

0.35 m / 14“

MOD from lens front

0.13 m / 5.1"

Length from flange

178 mm / 7.01“

Magnification Ratio at MOD (Paraxial)


Entrance pupil position (related to image plane, in direction to object)

183.4 mm / 7.22“

Angle of view H - V - D for LF Open Gate

82.8° / 63.0° / 94.0°

Front diameter

114 mm / 4.49“

Maximum housing diameter

115 mm / 4.53"

Weight (lens only)

2.1 kg / 4.6lb


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