Irix 15mm f/2.4 Firefly Ultra-Wide Angle Prime Lens for Nikon F

Ultra-wide perspectives with a bright f/2.4 aperture—the Irix 15mm Firefly is a manual focus prime that opens up dramatic compositions on full-frame Nikon DSLRs. Unlike heavier metal-barrel alternatives, this Firefly edition uses a lightweight composite body, making it a practical choice for travel, landscape, and architecture photographers who still demand high optical performance. The 110° diagonal angle of view captures expansive scenes with minimal distortion, while the fast aperture enables handheld shooting in challenging light and creative shallow depth-of-field effects.

Highlights

• Ultra-wide 15mm focal length with 110° angle of view for immersive landscapes and interiors
• Bright f/2.4 maximum aperture for low-light shooting and selective focus
• Advanced optical design with 15 elements in 11 groups, including 3 HR, 2 ED, and 2 aspherical elements
• Rounded 9-blade diaphragm for smooth, pleasing bokeh
• Weather-sealed construction with 3 sealing points for reliable outdoor use
• Lightweight composite body—ideal for travel and long shoots
• Manual focus with focus lock and infinity click for precise control
• Accepts 95mm screw-in filters and 30x30mm gel filters at the rear

In daily use

On location, the Firefly's manual focus ring offers a smooth, well-damped feel, and the focus lock lets you fix the distance for repeatable shots. The infinity click provides a tactile stop at the hyperfocal point, speeding up landscape setups. The bright f/2.4 aperture not only helps in dim conditions but also allows you to isolate subjects with a shallow depth of field—unusual for such a wide lens. The 0.28 m minimum focus distance lets you get close for exaggerated foregrounds, adding depth to your compositions. The weather sealing gives confidence when shooting in light rain or dusty environments, and the rear gel filter slot is a bonus for creative effects without bulky front filters.

Full specifications

• Lens type: Wide-angle prime lens
• Focal length: 15mm
• Maximum aperture: f/2.4
• Minimum aperture: f/22
• Lens mount: Nikon F
• Format compatibility: Full-frame (FX)
• Angle of view: 110° (diagonal)
• Optical design: 15 elements in 11 groups
• Special elements: 3x HR, 2x ED, 2x ASP
• Diaphragm blades: 9 (rounded)
• Minimum focus distance: 0.28 m (11.02 inches)
• Maximum magnification: 0.11x
• Focus type: Manual focus
• Image stabilization: No
• Front filter size: 95mm (screw-in)
• Rear filter slot: 30x30mm (gel filter)
• Weather sealing: Yes (3 sealing points)
• Construction material: Lightweight composite body
• Focus lock: Yes
• Infinity click: Yes

Final note

The Irix 15mm f/2.4 Firefly delivers ultra-wide creative potential in a travel-friendly package. Its combination of a bright aperture, robust optics, and weather resistance makes it a compelling choice for photographers who want to push the boundaries of wide-angle imaging without the weight penalty of traditional metal lenses.