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IRIX 11mm f/4 Blackstone

The IRIX 11mm f/4 is a 11mm f/4 lens designed for Canon EF, Nikon F, Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

IRIX 11mm f/4 Blackstone

IRIX 11mm f/4 Blackstone

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Lens Overview — IRIX 11mm f/4

The IRIX 11mm f/4 Blackstone is a manual-focus ultra-wide-angle prime lens designed for full-frame DSLR systems. With a fixed focal length of 11mm and a maximum aperture of f/4, it targets landscape, architecture, astrophotography, and interior photographers who value a compact, dedicated wide-angle tool over a zoom solution. The lens is compatible with Canon EF, Nikon F, and Pentax K mounts, making it accessible to a broad range of DSLR shooters without requiring a system change.

As a prime lens, it offers a single focal length with no zoom function, which typically rewards photographers with a simpler, more deliberate shooting approach. Focus is entirely manual, meaning there is no autofocus mechanism — a considered choice that suits the deliberate, tripod-based workflows common in wide-angle landscape and architectural work. The lens accepts 95mm front filters, which is a large thread size that will require dedicated filter accessories.

Weighing 790g, it has a substantial but manageable build. No image stabilization is present, consistent with its manual-focus, wide-angle character. Overall, the IRIX 11mm f/4 Blackstone is a focused, mount-versatile ultra-wide prime built for full-frame DSLR use.

Key Features — IRIX 11mm f/4

11mm Ultra-Wide Prime: Fixed 11mm focal length delivers an extremely wide field of view well suited to landscape, architecture, and interior photography.

Full-Frame Coverage: Designed to cover a full-frame image circle, ensuring no vignetting on any supported full-frame or crop-sensor DSLR body.

Canon EF, Nikon F, Pentax K: Available in three major DSLR mounts, making it accessible to a wide range of shooters without requiring a system change.

Manual Focus Only: No autofocus mechanism is present, suiting the deliberate, tripod-based workflows typical of landscape and architectural shooting.

f/4 Maximum Aperture: A fixed maximum aperture of f/4 provides consistent exposure across the frame and supports astrophotography and low-light wide-angle work.

Blackstone Build Quality: The Blackstone edition features a premium metal and glass construction with a focus lock mechanism for securing focus in the field.

Lens Specifications — IRIX 11mm f/4

IRIX 11mm f/4 full specifications
SpecDetail
Use CasesAstrophotography
Lens TypeUltra Wide-Angle
FormatFull Frame
Zoom/PrimePrime
Focal Length11mm
Maximum Aperturef/4
Camera SystemDSLR
Lens MountCanon EF, Nikon F, Pentax K
AutofocusNo
Focus TypeManual
Image StabilizationNone
Filter Thread95mm

Description — IRIX 11mm f/4

The IRIX 11mm f/4 Blackstone is an ultra-wide-angle prime lens built for full-frame DSLR systems. With a fixed 11mm focal length and a maximum aperture of f/4, it offers a consistent, wide field of view suited to architectural, landscape, and interior photography. The lens is offered in Canon EF, Nikon F, and Pentax K mounts, giving photographers across multiple DSLR platforms access to the same optical design without compromising on compatibility.

Focus is fully manual, with no autofocus capability, making it well suited to methodical, tripod-based shooting where precise focus placement is handled by the photographer directly. The lens features a 95mm filter thread, accommodating large-format filter systems for those who work with graduated ND or polarising filters. No image stabilization is included. The lens weighs 790g, giving it a solid, substantial feel in the hand.

As a prime lens in the ultra-wide category, it provides a single, purposeful focal length rather than a zoom range, rewarding photographers who commit to the 11mm perspective.

Pros — IRIX 11mm f/4

  • ✓Broad mount compatibility across Canon EF, Nikon F, and Pentax K systems
  • ✓Full-frame coverage ensures no crop vignetting on any supported DSLR body
  • ✓Prime lens design at 11mm delivers a dedicated ultra-wide-angle perspective

Cons — IRIX 11mm f/4

  • ✗No autofocus support, which limits suitability for fast-moving or action subjects
  • ✗No image stabilization, requiring stable support for sharp handheld results
  • ✗f/4 maximum aperture is relatively modest for low-light or astrophotography use

Reviews — IRIX 11mm f/4

Videos — IRIX 11mm f/4

Irix 11mm f/4 ' Firefly' lens review with samples (Full-frame and APS-C) — Christopher Frost

Resources & Downloads — IRIX 11mm f/4

Manuals & Guides

Frequently Asked Questions — IRIX 11mm f/4

Which camera mounts does the IRIX 11mm f/4 Blackstone support?+
The lens is available in Canon EF, Nikon F, and Pentax K mounts. All three are DSLR mounts, so this lens is designed specifically for DSLR camera systems.
Does the IRIX 11mm f/4 Blackstone cover full-frame sensors?+
Yes, the lens format is specified as Full Frame, meaning it is designed to cover a full-frame sensor without vignetting. It will also work on crop-sensor DSLRs using the same mounts.
Does this lens have autofocus?+
No. The IRIX 11mm f/4 Blackstone is a manual-focus-only lens. Autofocus is not available, and focus must be set manually by the photographer.
What filter size does the IRIX 11mm f/4 Blackstone use?+
The lens has a 95mm front filter thread. This is a large diameter, so photographers should ensure their filter system supports 95mm sizing before purchasing.
Does the lens include image stabilization?+
No. The specifications confirm that image stabilization is listed as None. Photographers should plan to use a tripod or other stabilizing support, particularly in lower light conditions.
How heavy is the IRIX 11mm f/4 Blackstone?+
The lens weighs 790g. This is a reasonably substantial weight for an ultra-wide prime, so it is worth factoring into decisions about travel or handheld use.

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