IRIX 15mm f/2.4 Blackstone Lens for Pentax K

IRIX 15mm f/2.4 Blackstone Lens for Pentax K

IRIX 15mm f/2.4 Blackstone Lens for Pentax K

B&H # IR15BSP MFR # IL-15BS-PK
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Product Highlights

  • Pentax K-Mount/Full-Frame Format
  • Aperture Range: f/2.4 to f/22
  • Two Aspherical Elements
  • Two ED and Three HR Elements
  • Neutrino Coating
  • Manual Focus Design with Focus Lock
  • UV Fluorescent Engraved Markings
  • Depth of Field and Focus Distance Scales
  • Weather-Sealed Magnesium Alloy Housing
  • Rounded Nine-Blade Diaphragm
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Style: Blackstone

Firefly Blackstone

Price: $674.95

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IRIX 15mm f/2.4 overview

  • 1Description

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.
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 specs

Performance
Focal Length 15mm
Aperture Maximum: f/2.4
Minimum: f/22
Camera Mount Type Pentax K
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 110°
Minimum Focus Distance 11.02" (28 cm)
Elements/Groups 15 / 11
Diaphragm Blades 9, Rounded
Features
Autofocus No
Physical
Filter Thread Front: 95 mm
Rear:
Dimensions (DxL) Approx. 4.49 x 3.94" (114 x 100 mm)
Weight 1.51 lb (685 g)
Packaging Info
Package Weight 3.0 lb
Box Dimensions (LxWxH) 6.8 x 5.6 x 5.5"

IRIX 15mm f/2.4 reviews

15mm f/2.4 Blackstone Lens for Pentax K is rated 5.0 out of 5 by 6.
Rated 5 out of 5 by from Great lens but had to re-calibrate Great lens, built well and takes great pictures but as the extended user manual states you may have to re-calibrate it.On mine when i turned the focus ring past infinity the lens became more in focus. I followed the instructions keeping the focus ring locked on infinity until the focus was dead on while the ring was on infinity.The reason i still gave it a 5 star was because I knew about this before i bought the lens.
Date published: 2017-11-25
Rated 5 out of 5 by from fantastic lens This lens does everything that I expected it to do for a ultra wide lens. Very sharp when stopped down to 5.6 especially for such a wide angle lens. This lens is large, you'll need to make space in your camera bag went's not mounted on the camera
Date published: 2017-04-23
Rated 5 out of 5 by from Excelente lente un lente increble, soy fotgrafo de deportivo y uso este lente en mi Pentax K1, de verdad es muy bueno es muy afilado y sus colores geniales me da grandes perspectivas, estoy my feliz con esta compra, muy bien por Irix !
Date published: 2017-04-17
Rated 5 out of 5 by from IRIX 15MM Blackstone Lens I am an amateur photographer. Bought the lens while on vacation in Glacier/Banff. Works perfectly on my Pentax K3. It is a very large lens, especially compared to the Pentax 21mm. Build quality is very tight. Form, fit and function is very good. Photo quality appears acceptable and is equal to or better than the Pentax 21mm lens. Bought the lens to get get wider view. Would be great for real-estate/room shots.
Date published: 2017-08-12
Rated 5 out of 5 by from WOW The Irix 15mm Lens Is a monster on my Petax K1. Im very Happy with My Night Photography. I Cant wait to try the 11MM.
Date published: 2017-07-02
Rated 5 out of 5 by from love the lens Have not used it in depth yet, but initial shots look very good
Date published: 2017-05-12
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