Irix 15mm f/2.4 Firefly Pentax

Irix 15mm f/2.4 Firefly Pentax – Perfect for Wide-Angle Photography

Irix 15mm f/2.4 Firefly Pentax is an ultra-wide-angle, rectangular manual focus lens, specifically designed for DSLR cameras. With a focal length of 15 mm, this lens is ideal for outdoor, nature, astro, and architectural photography. This lens allows photographers to capture impressive views and details with exceptional image quality.

Design and Optical Performance

The optical construction of the Irix Firefly wide-angle lens is of the highest standard and meets the most demanding needs of modern cameras. The lens consists of 15 elements in 11 groups, including three elements of high refractive index glass and two of extra-low dispersion glass. This ensures that images have high brightness, especially at the edges, while minimizing distortion and aberration. The two aspherical lenses also contribute to improving overall image quality.

Innovative Features for Manual Focus

Irix 15mm f/2.4 is equipped with several new features such as focus lock, infinity lock, and hyperfocal scale, enhancing the user experience of manual focus lenses. The sophisticated optical design and the special neutrino coating minimize chromatic aberration, ghosting, and flare to an absolute minimum, making the lens perfect for various lighting conditions.

Practical Design and Usability

The lens is designed with a minimum focusing distance of 0.25 meters (0.99 feet) and has nine rounded aperture blades, providing outstandingly smooth out-of-focus areas. The smart design allows the use of 95 mm screw filters in the front and gelatin filters in the back of the lens, giving photographers flexibility in their creative decisions. Its lightweight plastic construction saves 12% of the weight compared to the Blackstone model, making it easy to carry.

Specifications

• Image Size: 35mm "Full Frame"
• Focal Length: 15 mm
• Field of View: 110° (diagonal)
• Focusing Range: 0.25 m
• Focusing Type: Manual with lock function and focus confirmation
• Aperture Range: f/2.4 – f/22
• Aperture Control: Via camera
• Aperture Shape: 9 rounded blades
• Lens Construction: 15 elements in 11 groups (3X HR, 2X ED, 2X ASP)
• Front Filter Thread: 95 x 1.0 mm
• Rear Filter Thread: 30 x 30 mm
• Dimensions: 114 x 100 mm
• Weight: 608 g

Frequently asked questions

What is the focal length of the Irix 15mm f/2.4 Firefly Pentax?
The focal length is 15 mm.

What type of focus does the lens have?
The lens has manual focus with a locking function and focus confirmation.

What is the minimum focusing distance for this lens?
The minimum focusing distance is 0.25 meters.

How many elements and groups does the lens construction consist of?
The lens construction consists of 15 elements in 11 groups.