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
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Lens Overview — IRIX 11mm f/4
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
| Spec | Detail |
|---|---|
| Use Cases | Astrophotography |
| Lens Type | Ultra Wide-Angle |
| Format | Full Frame |
| Zoom/Prime | Prime |
| Focal Length | 11mm |
| Maximum Aperture | f/4 |
| Camera System | DSLR |
| Lens Mount | Canon EF, Nikon F, Pentax K |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 95mm |
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
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.