Skip to product overview

ARRI Signature Prime 21mm T1.8 Lens

The ARRI 21mm T1.8 is a 21mm f/1.8 cinema lens designed for LPL, PL Mount mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

ARRI Signature Prime 21mm T1.8 Lens

ARRI Signature Prime 21mm T1.8 Lens

Get notified when one lists.

We'll text or email you the moment a ARRI Signature Prime 21mm T1.8 Lens is listed on GearFocus.

Have a ARRI 21mm T1.8 sitting in your bag?

You'd be the first listing for this model.
Serious buyers are already watching — list yours in minutes.

Sell your ARRI 21mm T1.8 on GearFocus

Lens Overview — ARRI 21mm T1.8

The ARRI Signature Prime 21mm is a wide-angle prime cinema lens built for full-frame and large-format camera systems. Designed exclusively for the PL Mount, it integrates naturally into professional cinema camera workflows that rely on that standard. The lens operates at a maximum aperture of T1.8, offering strong light-gathering capability that is particularly valuable in controlled or low-light production environments where stopping down isn't always practical.

At 21mm, it sits in wide-angle territory, making it a practical choice for establishing shots, environmental storytelling, and scenes where a broader field of view is required without pushing into ultra-wide distortion. Focus is entirely manual, which aligns with standard cinema production practices where a dedicated focus puller operates the lens independently of the camera system. The lens is designed around a full-frame image circle, meaning it covers modern large-format cinema sensors without vignetting.

Weighing in at 1.7kg, it is a substantial but manageable build for professional rigging on cinema cameras. There is no image stabilization, consistent with expectations for a manual-focus cinema prime intended for use on stabilized rigs or tripod-mounted setups.

Key Features — ARRI 21mm T1.8

LPL & PL Mount: Ships with an LPL mount and includes a PL adapter, ensuring compatibility with ARRI ALEXA LF, ALEXA Mini LF, and other PL-mount cinema cameras.

T1.8 Maximum Aperture: A fast, consistent T-stop rating allows reliable exposure control and strong light-gathering performance on set.

21mm Wide-Angle Focal Length: Sits in practical wide-angle territory for establishing shots, interior environments, and scenes requiring broader spatial context.

Large-Format Image Circle: Covers full-frame and large-format cinema sensors such as the ALEXA LF and ALEXA Mini LF without vignetting.

Manual Focus Design: Smooth, cinema-standard focus ring is built for precise, repeatable focus pulls by a dedicated focus puller.

Consistent Front Diameter: Shares a common 95mm front diameter across the Signature Prime lineup, allowing filters and accessories to move between lenses without adjustment.

Lens Specifications — ARRI 21mm T1.8

ARRI 21mm T1.8 full specifications
SpecDetail
Use CasesVideo / Cinematography
Lens TypeCine
FormatFull Frame
Zoom/PrimePrime
Focal Length21mm
Maximum Aperturef/1.8
Camera SystemCinema / Video
Lens MountLPL, PL Mount
AutofocusNo
Focus TypeManual
Image StabilizationNone
Weight1.7kg

Description — ARRI 21mm T1.8

The ARRI Signature Prime 21mm is a wide-angle prime lens built for professional cinema production. It features a PL Mount, making it compatible with the broad range of cinema cameras that support this industry-standard interface. With a maximum aperture of T1.8, the lens captures a substantial amount of light, lending itself well to scenes where exposure latitude or shallow focus separation is a priority.

The full-frame lens format ensures complete sensor coverage on modern large-format cinema cameras, with no vignetting compromise. Focus is manual only, consistent with how cinema lenses are operated on professional sets where a focus puller manages the focus ring independently. The lens falls into the wide-angle focal length range at 21mm, a versatile perspective for environmental, architectural, and narrative wide shots.

Weighing 1.7kg, it offers a professional build weight that balances durability with practical on-set handling. There is no image stabilization, so external stabilization solutions should be factored into any production rig plan.

Pros — ARRI 21mm T1.8

  • ✓Wide maximum aperture of T1.8 supports strong light-gathering in cinema production
  • ✓Full-frame lens format provides coverage for large-format cinema sensors
  • ✓PL Mount compatibility integrates directly with professional cinema camera ecosystems

Cons — ARRI 21mm T1.8

  • ✗No image stabilization, requiring external stabilization solutions on set
  • ✗PL Mount limits compatibility to cinema camera systems equipped with that mount
  • ✗No autofocus capability, which may be a limitation for solo operators without a dedicated focus puller

Reviews — ARRI 21mm T1.8

Videos — ARRI 21mm T1.8

What Makes Cinema Lenses So Special!? | DEEP DIVE on Arri Signature Primes — Potato Jet

Resources & Downloads — ARRI 21mm T1.8

Manuals & Guides

Frequently Asked Questions — ARRI 21mm T1.8

What camera mount does the ARRI Signature Prime 21mm use?+
The lens uses a PL Mount, which is standard across a wide range of professional cinema cameras. It is not compatible with DSLR or mirrorless mounts without an adapter.
Does this lens cover full-frame sensors?+
Yes, the lens format is specified as Full Frame, meaning it is designed to cover full-frame and large-format cinema sensors without vignetting.
What is the maximum aperture of the ARRI Signature Prime 21mm?+
The maximum aperture is T1.8, which provides strong light transmission suitable for demanding lighting conditions on professional cinema productions.
Does this lens support autofocus?+
No, the ARRI Signature Prime 21mm is a manual focus lens only. This is standard for cinema prime lenses, where focus is typically controlled by a dedicated focus puller on set.
How heavy is the ARRI Signature Prime 21mm?+
The lens weighs 1.7kg. This is within a manageable range for professional cinema rigs, though rigging and support systems should be planned accordingly.
Is there a filter thread on the ARRI Signature Prime 21mm?+
The filter thread size is not specified in the available data. Buyers planning to use front-of-lens filtration should confirm filter attachment options directly before purchase.

Similar to ARRI 21mm T1.8

Loading similar products...