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IRIX 15mm f/2.4 Blackstone Lens for Pentax K

BH #IR15BSP • MFR #IL-15BS-PK
IRIX 15mm f/2.4 Blackstone Lens for Pentax K
Key Features
  • Pentax K-Mount/Full-Frame Format
  • Aperture Range: f/2.4 to f/22
  • Two Aspherical Elements
  • Two ED and Three HR Elements
Offering a wide-angle perspective, and characterized by its premium exterior build, the 15mm f/2.4 Blackstone Lens from Irix is a sophisticated prime lens designed for Pentax K-mount cameras. Benefitting the broad field of view is an advanced optical design that features aspherical, low-dispersion, and high-refractive index glass elements to control various aberrations and distortions, as well as maintain accurate and consistent color. A Neutrino coating is also utilized to control lens flare and ghosting and achieve a high degree of contrast and color fidelity when working in strong lighting conditions.
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IRIX 15mm f/2.4 Blackstone Overview

By B&H Photo's

Offering a wide-angle perspective, and characterized by its premium exterior build, the 15mm f/2.4 Blackstone Lens from Irix is a sophisticated prime lens designed for Pentax K-mount cameras. Benefitting the broad field of view is an advanced optical design that features aspherical, low-dispersion, and high-refractive index glass elements to control various aberrations and distortions, as well as maintain accurate and consistent color. A Neutrino coating is also utilized to control lens flare and ghosting and achieve a high degree of contrast and color fidelity when working in strong lighting conditions.

Complementing the optics, this 15mm f/2.4 makes use of a manual focus design for fine-tuned control, and incorporates a unique positive focus lock to secure the focusing position at any point for consistent, repeatable shooting. As the Blackstone version of this focal length, this lens is also distinguished by an aluminum and magnesium alloy exterior, engraved lens markings with fluorescent UV paint for high visibility, and extensive weather-sealing about the lens to permit working in harsh environments.

The Blackstone version of the 15mm f/2.4 lens features a durable aluminum and magnesium alloy housing and weather-resistant exterior along with inner seals, and an extra seal at the front element, to protect against dust and moisture intrusion. The metal exterior also distinguishes itself with an anti-scratch finish, and sports engraved focus distance and depth of field scales with fluorescent UV paint for high visibility when working in low-light conditions.
Wide-angle prime designed for full-frame Pentax K-mount DSLRs, this lens can also be used on APS-C models where it provides a 22.5mm equivalent focal length.
Two aspherical, three high-refractive index, and two extra-low dispersion elements are featured within the optical design to limit both spherical and chromatic aberrations, as well as color fringing and distortion, for improved clarity, sharpness, and even illumination.
A Neutrino coating has been applied to limit lens flare and ghosting for improved contrast and color fidelity.
Manual focus designed is benefitted by a positive focus lock mechanism to secure your focus position at any point to limit unwanted shifting of focus.
A hard click stop indicates the infinity position on the focus ring for easy use in low-visibility conditions.
Includes complimentary additional rear lens cap.
Large depth of field scale benefits using hyperfocal and pre-focus techniques.
Front of lens has 95mm-diameter filter threads and the rear of the lens accepts 30 x 30mm cut gel filters to lessen the likelihood of vignetting.
Rounded nine-blade diaphragm contributes to smooth bokeh.

IRIX 15mm f/2.4 Blackstone Specs

Key Specs
Focal Length
15mm
Maximum Aperture
f/2.4
Lens Mount
Pentax K
Lens Format Coverage
Full-Frame
Focus Type
Manual Focus
Image Stabilization
No
Filter Size
95 mm (Front)
Gel Filter (Rear)
Maximum Aperture
f/2.4
Minimum Aperture
f/22
Lens Mount
Pentax K
Lens Format Coverage
Full-Frame
Angle of View
110°
Minimum Focus Distance
11.02" / 28 cm
Optical Design
15 Elements in 11 Groups
Diaphragm Blades
9, Rounded
Focus Type
Manual Focus
Image Stabilization
No
Filter Size
95 mm (Front)
Gel Filter (Rear)
Dimensions (ø x L)
4.49 x 3.94" / 114 x 100 mm
Weight
1.51 lb / 685 g
Packaging Info
Package Weight
2.765 lb
Box Dimensions (LxWxH)
6.5 x 6.1 x 5.5"

IRIX 15mm f/2.4 Blackstone Reviews

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