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IRIX 15mm f/2.4 Blackstone

The IRIX 15mm f/2.4 is a 15mm f/2.4 lens designed for Canon EF, Nikon F, Pentax K mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

IRIX 15mm f/2.4 Blackstone

IRIX 15mm f/2.4 Blackstone

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Lens Overview — IRIX 15mm f/2.4

The IRIX 15mm f/2.4 Blackstone is a manual focus, wide-angle prime lens built for full-frame DSLR systems. With a maximum aperture of f/2.4, it delivers a relatively bright light-gathering capability for a lens in this ultra-wide focal length class, making it a practical option for low-light shooting scenarios. Designed specifically for DSLR camera systems, it is compatible with Canon EF, Nikon F, and Pentax K mounts, giving it broad reach across three major DSLR ecosystems.

The lens is a pure prime, fixed at 15mm, which places it firmly in wide-angle territory — well suited for landscape, architectural, astrophotography, and environmental work where a sweeping field of view is desirable. At 685 grams, it has a solid, substantial build that aligns with the Blackstone name, suggesting a premium construction. The filter thread measures 95mm, which is on the larger side and worth factoring into any existing filter kit.

There is no autofocus or image stabilization, so shooters must rely entirely on manual focus technique and steady handling. Overall, this is a specialist wide-angle prime aimed at deliberate, thoughtful shooters who prioritize optical quality and manual control.

Key Features — IRIX 15mm f/2.4

15mm f/2.4 Prime: Fixed ultra-wide focal length with a relatively bright maximum aperture for a lens in this class, useful for low-light landscapes and astrophotography.

Full-Frame Coverage: Designed to cover a full-frame image circle, ensuring no cropping or vignetting on compatible full-frame DSLR bodies.

Three-Mount Compatibility: Available in Canon EF, Nikon F, and Pentax K mounts, covering three major DSLR ecosystems.

Manual Focus Only: No autofocus motor — the lens is built entirely for manual focus shooters who prefer deliberate control over focus placement.

Blackstone Build Quality: The Blackstone variant features a premium metal and glass construction with a weather-sealed design for use in outdoor conditions.

Focus Lock Mechanism: Includes a focus lock screw that lets shooters lock the focus ring at a set distance, useful for hyperfocal astrophotography work.

Lens Specifications — IRIX 15mm f/2.4

IRIX 15mm f/2.4 full specifications
SpecDetail
Use CasesAstrophotography, Travel
Lens TypeUltra Wide-Angle
FormatFull Frame
Zoom/PrimePrime
Focal Length15mm
Maximum Aperturef/2.4
Camera SystemDSLR
Lens MountCanon EF, Nikon F, Pentax K
AutofocusNo
Focus TypeManual
Image StabilizationNone
Filter Thread95mm

Description — IRIX 15mm f/2.4

The IRIX 15mm f/2.4 Blackstone is a manual focus wide-angle prime lens designed for full-frame DSLR systems. It offers a fixed 15mm focal length and a maximum aperture of f/2.4, providing solid light-gathering performance in this ultra-wide class. The lens is available across three major DSLR mount platforms — Canon EF, Nikon F, and Pentax K — making it an accessible option for a wide range of DSLR shooters.

With a 95mm filter thread, users should be prepared to invest in appropriately sized front filters. The lens weighs 685 grams, reflecting the Blackstone build quality that the name implies. There is no image stabilization and no autofocus, positioning this lens squarely for photographers who prefer deliberate, manual control over their focus and exposure decisions — particularly those working in landscape, architecture, or night sky photography where a wide, bright perspective is essential.

Pros — IRIX 15mm f/2.4

  • ✓Bright f/2.4 maximum aperture for a 15mm wide-angle prime
  • ✓Compatible with three major DSLR mount systems: Canon EF, Nikon F, and Pentax K
  • ✓Full-frame coverage ensures no crop or vignetting concerns on compatible bodies

Cons — IRIX 15mm f/2.4

  • ✗Manual focus only — no autofocus support for any mount variant
  • ✗No image stabilization, requiring careful technique in handheld shooting
  • ✗Large 95mm filter thread size adds cost and limits filter compatibility with existing kits

Reviews — IRIX 15mm f/2.4

Videos — IRIX 15mm f/2.4

Irix 15mm f/2.4 'Blackstone' lens review with samples (Full-frame and APS-C) — Christopher Frost

Resources & Downloads — IRIX 15mm f/2.4

Manuals & Guides

Frequently Asked Questions — IRIX 15mm f/2.4

Which camera mounts is the IRIX 15mm f/2.4 Blackstone compatible with?+
The lens is available in Canon EF, Nikon F, and Pentax K mounts. All three are DSLR mounts, and the lens is designed for full-frame DSLR camera systems.
Does this lens have autofocus?+
No. The IRIX 15mm f/2.4 Blackstone is a manual focus lens only. There is no autofocus motor of any kind, so focus must be set entirely by hand.
Is this lens compatible with full-frame cameras?+
Yes. The lens format is specified as Full Frame, meaning it is designed to cover a full-frame image circle without vignetting on compatible full-frame DSLR bodies.
What filter size does the IRIX 15mm f/2.4 Blackstone use?+
The lens has a 95mm filter thread. This is a larger-than-average filter size, so existing 77mm or 82mm filters will not fit without a step-up ring.
Does the lens include image stabilization?+
No. Image stabilization is listed as None in the specifications. Shooters will need to rely on steady technique or a tripod to manage camera shake, particularly in lower light conditions.
How heavy is the IRIX 15mm f/2.4 Blackstone?+
The lens weighs 685 grams. This is a fairly substantial weight for a prime lens and is worth considering when planning a travel or handheld shooting kit.

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