Irix 11mm f/4 Blackstone Ultra-Wide Angle Prime Lens for Canon EF

With a sweeping 126° diagonal angle of view, the Irix 11mm f/4 Blackstone opens up dramatic ultra-wide perspectives for full-frame Canon EF cameras. This manual focus prime is built around an advanced 16-element optical design that includes four high-refractive-index elements, three aspherical elements, and two extra-low dispersion elements to keep distortion, chromatic aberration, and coma tightly controlled across the frame.

Overview

The Irix 11mm f/4 Blackstone is a premium ultra-wide prime lens engineered for landscape, architecture, astrophotography, and interior photography. Its robust aluminum-magnesium alloy barrel is sealed against dust and moisture with three gaskets, making it reliable in challenging outdoor conditions. The lens features a built-in petal-type hood, a rear gel filter slot for 30 x 30 mm filters, and a focus lock mechanism for precise manual focusing.

What stands out

• Ultra-wide 11mm focal length with 126° diagonal field of view on full-frame sensors
• Sophisticated optical formula: 16 elements in 10 groups, including 4 HR, 3 ASP, and 2 ED elements
• Weather-sealed construction with three gaskets for dust and moisture resistance
• Manual focus design with focus lock, hyperfocal scale, and infinity click-stop
• Rear gel filter slot (30 x 30 mm) for creative filtration without bulky front filters
• Durable aluminum-magnesium alloy barrel with UV-reactive engravings for low-light visibility

Technical details

• Focal length: 11mm
• Maximum aperture: f/4
• Minimum aperture: f/22
• Lens mount: Canon EF
• Format compatibility: Full-frame
• Minimum focus distance: 0.28 m (11.02 in)
• Diaphragm: 9 rounded blades
• Focus type: Manual focus
• Filter type: Rear gel filter slot (30 x 30 mm)
• Weather sealing: Yes (3 sealing gaskets)
• Construction material: Aluminum-magnesium alloy
• Lens hood: Built-in petal-type

Our verdict

The Irix 11mm f/4 Blackstone delivers exceptional ultra-wide performance with professional-grade build quality. Its weather sealing, precise manual focus, and advanced optics make it a compelling choice for photographers who demand both durability and edge-to-edge sharpness in extreme wide-angle shooting.