Irix 11mm f/4 Firefly Ultra-Wide Prime Lens for Nikon F

Ultra-wide photography demands a lens that can capture expansive scenes with edge-to-edge sharpness, and the Irix 11mm f/4 Firefly for Nikon F delivers exactly that in a remarkably lightweight package. Unlike many ultra-wides that compromise on portability or optical quality, this lens combines a sophisticated 16-element design with a composite body that weighs just a fraction of metal alternatives, making it an ideal companion for landscape, architecture, and astrophotography adventures.

Highlights

• Ultra-wide 11mm focal length with a 126° diagonal angle of view for dramatic perspectives
• Bright f/4 maximum aperture with 9 rounded diaphragm blades for smooth bokeh and excellent low-light performance
• Advanced optical construction: 16 elements in 10 groups, including 4 high-refractive (HR), 2 extra-low dispersion (ED), and 3 aspherical elements to minimize aberrations and distortion
• Weather-sealed design with 3 rubber seals to protect against dust and moisture
• Manual focus with a focus lock and hyperfocal scale for precise control
• Rear gel filter slot (30 x 30 mm) for creative filtration without bulky front filters
• Electronic contacts for aperture control and EXIF data transmission
• UV-reactive engravings for easy readability in low light

In daily use

The Firefly series is renowned for its balance of performance and portability, and this 11mm lens is no exception. The lightweight composite construction reduces fatigue during long shoots, while the weather sealing ensures reliability in challenging conditions. The manual focus ring offers a smooth, precise feel, and the focus lock lets you fix the distance for consistent results in time-lapse or astro work. The hyperfocal scale is a boon for landscape photographers who need maximum depth of field without guesswork. The rear gel filter slot accepts standard 30x30mm gels, allowing you to use ND or color filters even with the bulbous front element.

Full specifications

• Lens type: Ultra-wide prime lens
• Focal length: 11mm
• Maximum aperture: f/4
• Minimum aperture: f/22
• Lens mount: Nikon F
• Format compatibility: Full-frame (FX)
• Angle of view: 126° diagonal
• Optical design: 16 elements in 10 groups
• Special elements: 4x HR, 2x ED, 3x aspherical
• Diaphragm blades: 9, rounded
• Minimum focus distance: 0.28 m (0.92 ft)
• Focus type: Manual
• Filter size: Rear gel filter slot (30 x 30 mm)
• Weather sealing: Yes (3 rubber seals)
• Focus lock: Yes
• Hyperfocal scale: Yes
• Electronic contacts: Yes
• Construction material: Lightweight composite
• Series: Firefly

Final note

The Irix 11mm f/4 Firefly is a compelling choice for Nikon F shooters who want an ultra-wide perspective without the weight penalty. Its robust feature set and weather sealing make it a reliable tool for outdoor photography, while the manual focus design appeals to those who prefer full control.