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Irix 15mm f/2.4 Firefly Lens

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 Firefly Lens

Irix 15mm f/2.4 Firefly Lens

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Lens Overview — Irix 15mm f/2.4

The Irix 15mm f/2.4 Firefly is a manual-focus wide-angle prime lens built for full-frame DSLR systems. Available in Canon EF, Nikon F, and Pentax K mounts, it offers broad compatibility across major DSLR platforms. The f/2.4 maximum aperture provides a respectably wide opening for a lens in this focal length range, making it a practical choice for low-light shooting situations where a wider field of view is desirable.

At 15mm on a full-frame sensor, photographers gain a sweeping wide-angle perspective well suited to landscape, architectural, and night sky work. The lens is manual focus only, which means autofocus shooters will need to adjust their workflow, but this also keeps the optical and mechanical design focused on image quality and build simplicity rather than AF motor integration. Weighing in at 581g, it sits in a manageable range for a full-frame wide prime.

The 95mm filter thread is notably large, a common characteristic of ultra-wide lenses with prominent front elements, so filter costs should be factored into the purchase decision. Overall, the Firefly is a purpose-built wide prime for DSLR shooters who are comfortable with manual focus operation.

Key Features — Irix 15mm f/2.4

15mm Full-Frame Prime: Covers a full-frame sensor with a sweeping wide-angle field of view well suited to landscapes, architecture, and astrophotography.

f/2.4 Maximum Aperture: A wide opening for a 15mm lens, giving photographers a practical advantage in low-light conditions such as night sky shooting.

Manual Focus Only: Precision manual focus ring with no AF motor, keeping operation simple and reliable for photographers comfortable with manual workflows.

Three-Mount Compatibility: Available in Canon EF, Nikon F, and Pentax K mounts, covering the most widely used full-frame DSLR systems.

95mm Filter Thread: Large-diameter front thread accommodates 95mm filters, a result of the prominent front element typical of ultra-wide primes.

581g Lens Weight: Relatively manageable weight for a full-frame ultra-wide prime, making it comfortable for extended handheld or tripod use.

Lens Specifications — Irix 15mm f/2.4

Irix 15mm f/2.4 full specifications
SpecDetail
Use CasesLandscape, Astrophotography, Architecture, Creative Effects
Lens TypePrime
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 Firefly is a manual focus, full-frame wide-angle prime designed for DSLR systems. With a 15mm focal length and a maximum aperture of f/2.4, it delivers a wide field of view with a reasonably fast aperture for a lens at this end of the focal length spectrum. The lens is available in Canon EF, Nikon F, and Pentax K mounts, giving it strong compatibility across the major DSLR ecosystems.

At 581g, it is a physically manageable option for shooters who want a dedicated wide prime without excessive bulk. The 95mm filter thread is worth noting — filters at this diameter are larger and more costly than standard sizes, so plan accordingly if front-mounted filtration is part of your workflow. With no image stabilization and manual focus only, the Firefly is a straightforward optical tool that suits photographers who prefer deliberate, hands-on control over their focus and exposure.

Pros — Irix 15mm f/2.4

  • ✓Wide f/2.4 maximum aperture for a 15mm full-frame prime
  • ✓Compatible with three major DSLR mounts: Canon EF, Nikon F, and Pentax K
  • ✓Full-frame coverage at 15mm focal length

Cons — Irix 15mm f/2.4

  • ✗Manual focus only — no autofocus available in any mount version
  • ✗Large 95mm filter thread increases the cost of compatible filters significantly
  • ✗No image stabilization

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 Firefly available in?+
The lens is available in Canon EF, Nikon F, and Pentax K mounts, covering the three major DSLR platforms. Make sure to select the correct mount version for your camera body at the time of purchase.
Does this lens support autofocus?+
No — the Irix 15mm f/2.4 Firefly is a manual focus lens. There is no autofocus capability in any of its available mount versions, so focusing must be done entirely by hand.
Will this lens cover a full-frame sensor?+
Yes, the lens is specified as a full-frame format lens, meaning it is designed to provide coverage for full-frame DSLR sensors. It can also be used on APS-C DSLR bodies within the same mount systems.
What size filters does the Irix 15mm f/2.4 Firefly require?+
The lens has a 95mm filter thread. This is a large diameter, so compatible filters tend to be more expensive and less commonly available than smaller sizes. It is worth budgeting for this if you plan to use screw-on filters.
How much does the Irix 15mm f/2.4 Firefly weigh?+
The lens weighs 581g. This is a relatively manageable weight for a full-frame wide-angle prime, though it is worth considering when pairing with lighter camera bodies.

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