IRIX 15mm f/2.4 Firefly Lens for Pentax K

IRIX 15mm f/2.4 Firefly Lens for Pentax K

IRIX 15mm f/2.4 Firefly Lens for Pentax K

B&H # IR15FFP MFR # IL-15FF-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
  • Rubberized Focus Ring
  • Depth of Field and Focus Distance Scales
  • Weather-Sealed ABS Plastic Housing
  • Rounded Nine-Blade Diaphragm
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Price: $475.00

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IRIX 15mm f/2.4 overview

  • 1Description

An impressively wide prime lens, the Pentax K-mount 15mm f/2.4 Firefly Lens from Irix meshes an advanced optical design with a lightweight, durable physical construction. The expansive field of view is complemented by a sophisticated optical layout that utilizes low dispersion, aspherical, and high-refractive glass elements, as well as a Neutrino coating, to render imagery with low distortion, controlled spherical and chromatic aberrations, high contrast, and natural color rendering.

In addition to the imaging performance, this 15mm f/2.4 utilizes 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 Firefly version of this focal length, this lens is also distinguished by a lightweight ABS plastic exterior, printed lens markings, and weather-sealing about the lens housing to permit working in trying environmental conditions.

The Firefly version of the 15mm f/2.4 lens features a lightweight ABS plastic exterior construction that is sealed against moisture and dust along the main body of the lens. The Firefly construction also incorporates a rubber focus ring for improved grip and control, and has printed focus distance and depth of field scales to aid working with pre-focusing and hyperfocal focusing techniques.
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
Optical Design 15 Elements in 11 Groups
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 1.28 lb / 581 g
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Package Weight 3.2 lb
Box Dimensions (LxWxH) 6.6 x 5.5 x 5.4"

IRIX 15mm f/2.4 reviews

15mm f/2.4 Firefly Lens for Pentax K is rated 3.8 out of 5 by 5.
Rated 4 out of 5 by from Good wide angle lens at infinity On the plus side it takes reasonably sharp pics at infinity, though you have to make sure that you set the focus to infinity rather than past it. Taking pictures of the inside of a room is difficult. The Pentax K1's focus assist won't always detect when something is in focus, and moving the focus ring along the 5 degree angle between infinity and 1m is an exercise in patience. The click that is supposed to occur at infinity is also a bit difficult to detect. I am not a pro photographer at all, so I may come back and revise this review once I get better at using it or have something else to compare it to.
Date published: 2017-08-16
Rated 5 out of 5 by from Fantastic�ultra wide lens!!! Build quality is superb. Smooth focus with clicks in at infinity. Very sharp lens out to the corners. Distortion is very well controlled. Little bit of vignetting but not bad. Easily fixable in post processing, if necessary. Very easy to use, for most my shots I set it on at infinity and set the aperture more than f5.6 to get every things in focus.
Date published: 2017-12-24
Rated 3 out of 5 by from Sharpness is great,but... I use Pentax k-1. This lens has very good sharpness. But It never reach a infinity. I bought two same irix 15/2.4 from other sellers, but both have same problem. You certainly have to adjust infinity position.
Date published: 2017-12-15
Rated 2 out of 5 by from Focus wasn't calibrated when it arrived. It's a nice lens, and it takes nice pictures, now. But when it arrived the focus was super out of calibration, and the manual is really unclear how the focus calibration works.� If anyone's trying to calibrate it; you need a lot of movement to have any affect in the ring (like more than a quarter turn, mine needed almost a full turn to calibrate). It's nice that you can calibrate the focus, but it would be nicer if it came calibrated from the manufacture.
Date published: 2018-05-10
Rated 5 out of 5 by from Excellent Wow. Super sharp. Focus works great. Great for landscapes and indoor rooms.
Date published: 2017-09-15
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IRIX 15mm f/2.4 Q&A

IRIX 15mm f/2.4 accessories

Designed for use with:

  • Pentax K-1
  • Pentax K-1 II
  • Pentax K-3 II
  • Pentax K-70
  • Pentax K-S2
  • Pentax KP
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