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Irix 15mm f/2.4 Firefly Lens for Pentax K

Model: IL-15FF-PK

Irix Warranty - USA Version
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Specifications

Physical

Weight 1.28 lb (581 g)
Filter Thread Front: 95 mmRear Gel:
Dimensions (DxL) Approx. 4.49 x 3.94" (114 x 100 mm)

Performance

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
Focal Length 15mm
Aperture Maximum: f/2.4Minimum: f/22
Camera Mount Type Pentax K

Packaging Info

Package Weight 3.2 lb
Box Dimensions (LxWxH) 6.6 x 5.5 x 5.4"

Features

Autofocus No
Expert Reviews
Digital camera world.35029809
25 May 2018

The Irix 15mm combines impressive handling and build quality with superb image quality, at a bargain price. The only flaw in our review sample was the lack of exposure consistency. The Irix 15mm f/2.4 combines impressive handling and build quality with superb image quality, at a bargain price.

  • +

    Smooth controls, Compatible with auto exposure, Excellent sharpness

  • -

    Manual focus only, Some vignetting at wider apertures, Occasionally erratic aperture control

The phoblographer.34645560
16 October 2018

The IRIX 15mm f2.4 FireFly isn’t at all a bad lens. But it isn’t as good as its Blackstone variant. It isn’t as sharp or as well built. But that doesn’t mean that it isn’t still well built or sharp.

User Reviews
18 April 2017
10/10

Lens was bigger than I had expected but fits perfectly on my 6d and feels ergonomically correct. Build quality is superb. Smooth focus. Clicks in at infinity and is accurate. Very sharp lens out to the corners. Comparable too my L glass and maybe even a touch better.

10 May 2018
4.0/10

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...

2 August 2017
10/10

Bought this to do wide night astro images... Haven't had a chance to use it for that yet, but in general shooting the quality is great. It can even make for some fun creative shots... I have been shooting with it on a 5DmkIII... I have not had issues with the flairs that some report.

16 August 2017
8.0/10

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.

25 May 2017
10/10

One filter at a time. You will get vignetting with two. I've had it for three weeks and I have put it through Rain and Sun works great in Low Light and has great minimum focusing distance..

13 January 2018
8.0/10

I liked but in the end of the day I may would choose the 11mm version. Or both I think LOL

24 December 2017
10/10

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.

15 November 2017
2.0/10

Let me begin by saying the 15mm Irix Firefly is a great lens for the money you are paying. I enjoyed the crisp images that this lens produced. The lens had a vignetting effect as the aperture got around 3.0. This was a great lens though.

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
In The Box
  • IRIX 15mm f/2.4 Firefly Lens for Pentax K
  • 95mm Front Lens Cap for 15mm f/2.4 Blackstone or Firefly
  • Rear Cap for Pentax K-Mount Lenses
  • Lens Hood for 15mm f/2.4
  • Soft Lens Pouch (Gray)
  • Limited 5-Year Warranty
Still Have Questions?
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