IRIX 11mm f/4 Firefly Lens for Canon EF

The IRIX 11mm f/4 Firefly is an ultra-wide-angle manual-focus prime lens designed for Canon EF-mount cameras, offering a budget-friendly entry point into IRIX’s 11mm ultra-wide lineup alongside the pricier IRIX 11mm f/4 Blackstone version. It’s aimed at landscape, architecture, interior, and astrophotography photographers who need dramatic ultra-wide coverage and full-frame compatibility without the higher cost of the Blackstone edition.

Optically, the lens offers an 11mm focal length with a maximum aperture of f/4, delivering an extremely wide field of view on full-frame Canon bodies well suited to expansive landscapes, tight interior spaces, architectural photography, and night sky imaging where capturing as much of the scene as possible matters. The lens’s multi-element optical design is aimed at controlling distortion and aberrations common in ultra-wide lenses, while maintaining sharpness across the frame, including toward the corners.

As a fully manual-focus lens, focus is controlled entirely by hand via the lens’s focus ring, with no autofocus motor or electronic communication for focus operation, consistent with IRIX’s design philosophy across its lens lineup that prioritizes precise manual control for the deliberate, considered shooting typical of landscape and astro photography. The lens includes IRIX’s signature focus lock feature, allowing photographers to lock focus at infinity or any other chosen distance to prevent accidental focus shift during handling or transport, particularly useful for astrophotography where maintaining critical infinity focus is essential. A clicked aperture ring provides tactile, repeatable aperture selection directly on the lens barrel.

Build quality for the Firefly edition uses a polymer composite barrel construction, a lighter and more affordable alternative to the Blackstone version’s magnesium and aluminum housing, while still retaining weather-sealing at critical points to help protect against dust and moisture during outdoor shooting. The lens accepts a rear gel filter holder given its ultra-wide bulbous front element design, rather than a standard front filter thread.

As a full-frame-compatible lens, the IRIX 11mm f/4 Firefly delivers its full ultra-wide angle of view on full-frame Canon EF-mount bodies while producing a narrower, though still wide, effective field of view on APS-C Canon bodies.

Key Features
– 11mm f/4 ultra-wide-angle prime lens for Canon EF mount
– Fully manual focus operation
– Focus lock feature (infinity and other distances)
– Clicked aperture ring
– Polymer composite barrel construction
– Weather-sealed at critical points
– Rear gel filter holder (no front filter thread)
– Compatible with full-frame and APS-C Canon EF-mount cameras