Irix Lens 11mm f/4 Firefly for Pentax

€ 555.00
4512

The extremely wide-angle, rectilinear manual focus lens designed for DSLR cameras.

Buy Irix 11mm f/4 Firefly and get 60% discount for SNS-HDR software

Irix Lens 11mm

€ 555.00
Quantity :

Hurry! Only 209 Left in Stock!

Whether you’re a professional photographer looking for a lens for your next shoot, or an amature looking for to expand your lens set, this one’s for you.

The Irix 11mm f/4.0 is an ultra-wide-angle lens created for your full frame (35mm) camera. Our 11mm lens is an extremely wide Full Frame rectilinear lens with a 126° angle of view. 4 high refractive lenses, 2 ED lenses and 3 aspherical lenses guarantee minimal distortion, as low as 3.13%, making our 11mm f/4.0 lens absolutely unique in its class.

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We know how important it is to protect your gear. All Irix lenses are made with phenomenal precision. Each Irix lens is equipped with a weather sealed construction which protects the interior against dust and moisture. Thanks to inner seals, our lenses are also protected from accidental water splashes. No matter the journey, you can be confident that our weather sealed lenses will offer you maximum resistance to the extremes.

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Firefly is the standard version equipped with three rubber seals that protect camera mount and focusing mechanism against dust, moisture and side accidental water splashes. Ergonomic focusing ring with rubber grip offers the freedom to operate with the camera. It is the most lightweight lens in its class.

Additional Features

  • Infinity click – Enables quick, easy, and precise focusing. During focusing, you’ll feel the moment when your lens hits infinity, which is extremely useful when shooting in difficult lighting conditions (I.e. at night).
  • Focus Lock – Allows you to lock the focusing ring in a specific position, which is extremely beneficial when you want to keep a specific focus plane, i.e. for astrophotography, or when using the hyperfocal scale.
  • Focus Calibration Window – due to the specifics of focus detection in DSLR cameras (which are based on phase detection), sometimes it may happen that the lens needs synchronization with the camera. Thanks to this special window you can easily calibrate the lens at home using basic tools within 5 minutes. Fast, simple and effective!
  • Rear Gel Filter Slot – Allows the use of neutral gray filters, (a unique feature of the Irix 11mm f/4.0), against the background of competing ultra-wide-angle builds that do not have the option of using filters.
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Kit includes:

  • Irix 11mm f4 Firefly for Pentax
  • lens hood
  • front lens cap
  • 2 rear lens caps
  • soft lens pouch
  • metal box

Frequently Asked Questions (FAQ)

Here you will find answers to the most frequently asked questions about our products.

What are the main features of the Irix 11mm f/4 Firefly lens?
The Irix 11mm f/4 Firefly is an ultra-wide-angle prime lens that offers an impressive field of view. Its features include manual focus, low distortion, and high-quality construction from durable, yet lightweight materials. Read more...
Is the Irix 11mm f/4 Firefly lens compatible with all Pentax cameras?
The lens is compatible with Pentax full-frame and APS-C DSLRs with an K mount. When using with APS-C cameras, the crop factor should be considered, which changes the effective focal length of the lens. Read more...
What applications are best suited for the Irix 11mm f/4 Firefly lens?
Due to its ultra-wide perspective, the lens is ideal for landscape photography, architectural photography, and other situations where capturing expansive scenes or spaces is desired. Read more...
Does the lens have image stabilization?
No, the Irix 11mm f/4 Firefly does not have built-in image stabilization. When shooting in difficult lighting conditions or with slow shutter speeds, the use of a tripod is recommended. Read more...

Data sheet content

Obiektywy foto

Series
Firefly
Mount
Pentax K
Focal length
11mm
Sensor size
full frame
Maximum aperture
f/2.4
Minimum aperture
f/22
Filter diameter
not applicable
Type
wideangle
Apreture blades count
9
Lens composition
11 elements in 9 groups
Minimum focusing distance
0.27m
Focal lenght type
prime
Stabilization
no
Focus type
manual
Rear gel filter slot
30 x 30mm
Weather sealing
3 rubber o-rings
Focus ring distance scale
metric
Size (mm)
118 x 103mm
Weight (kg)
0.83
WHAT IS THE FIELD OF VIEW FOR THE IRIX 11MM F/4 FIREFLY LENS?
The Irix 11mm f/4 Firefly lens offers an ultra-wide 126-degree field of view.
WHAT TYPE OF CAMERAS IS THIS LENS COMPATIBLE WITH?
Yes, this lens is designed for full-frame (35mm) cameras but is fully compatible with APS-C sensor cameras as well, making it versatile across different camera bodies with a Pentax K mount.
IS THE IRIX 11MM F/4 FIREFLY WEATHER-SEALED?
Yes, this lens features a superb weather-sealed construction that protects it against moisture, dust, and sand, making it suitable for challenging conditions.
WHAT ARE THE APERTURE DETAILS OF THIS LENS?
It has a fast f/4.0 aperture and includes 9 rounded aperture blades to enhance image quality across the entire frame.
CAN THE IRIX 11MM F/4 FIREFLY LENS BE USED WITH BOTH FULL-FRAME AND APS-C CAMERAS?
Yes, this lens is designed for full-frame (35mm) cameras but is fully compatible with APS-C sensor cameras as well, making it versatile across different camera bodies with a Pentax K mount
WHAT ARE THE DIFFERENCES BETWEEN THE FIREFLY AND BLACKSTONE VERSIONS OF THE IRIX 11MM F/4 LENS?
The Firefly version features a lightweight composite construction with a textured rubber focus ring for smooth operation and comes with a soft pouch. The Blackstone version offers a more robust, entirely metal construction with engraved UV-reactive markings aiding in low-light settings and is supplied with a hard case.
WHAT IS THE MINIMUM FOCUSING DISTANCE OF THE LENS?
The minimum focusing distance of the Irix 11mm f/4 is only 28cm, allowing for close-up shots with wide perspectives.
DOES THE LENS SUPPORT ANY SPECIAL FOCUSING FEATURES?
The lens includes an infinity click feature for precise infinity focusing and a focus lock to maintain a specific focus setting, useful in astrophotography or when using the hyperfocal scale.
WHAT KIND OF OPTICAL DESIGN DOES THIS LENS HAVE?
It consists of 16 elements in 10 groups, including 4 refractive elements, 2 ED elements, and 3 aspherical elements, to ensure sharp, high-quality images.
ARE THERE ANY FILTER OPTIONS AVAILABLE WITH THIS LENS?
The lens features a rear gel filter slot, enabling the use of neutral gray filters, which is a unique feature among ultra-wide-angle lenses.
HOW DURABLE IS THE LENS CONSTRUCTION?
The Firefly version has a lightweight composite build with a rubber focus ring, whereas the Blackstone version boasts a reinforced full-metal construction with engraved markings.
WHAT ACCESSORIES ARE INCLUDED WITH THE LENS?
The Firefly version comes with a soft pouch, while the Blackstone version includes a hard case.
HOW DOES THE LENS COMMUNICATE WITH THE CAMERA?
It includes a module that allows control of the lens' aperture directly from the camera, supporting semi-automatic modes (PASM) and recording data in EXIF format.
IS THERE ANY SUPPORT FOR FOCUS CONFIRMATION?
Yes, the lens has a focus confirmation system that indicates the correct focus through an icon in the viewfinder or a sound.
CAN I CALIBRATE THE FOCUS OF THIS LENS?
The lens features a focus calibration window, enabling users to calibrate the lens at home using basic tools within minutes, ensuring accurate focus detection.

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"The Irix 11mm f/4 is an excellent ultra-wide-angle prime lens that delivers very good image quality. Sharpness in the centre of the frame is excellent throughout the aperture range, even wide open at f/4, as are the edges, with f/5.6-f/11 producing the best results. The Irix 11mm f/4 is a pleasure to use, thanks to its superb build quality, smooth focus ring and hyperfocal scale." Read full review

"What an exciting lens the Irix 11mm f/4 Firefly is. It opens up a whole new world of creative possibilities in a well-made, well-designed package that delivers the image quality. It will not be for everybody, perhaps because of the ultra-wide style of the images, or maybe because of difficulties using the manual focus system, but if the lens appeals to the individual photographer's creativity then it will be a rewarding experience." Read full review

"The Irix 11mm f/4 Blackstone is a well made and competitively priced ultrawide lens for full-frame Canon, Nikon and Pentax DSLRs. Image quality and handling are very good, but if our test sample lens is anything to go by, you may have to make some exposure corrections to compensate for the lens's imprecise aperture diaphragm control." Read full review

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"Urban, real estate, and landscape photographers looking for the widest possible focal without fisheye effect should be pleased by this product." Read full review

"Irix came up with an appealing piece of well-designed ultrawide lens. At the time being, it is the widest rectilinear lens available, offering good sharpness, very controlled amount of distortion – and that all in a body that is perfectly weather-sealed (Blackstone version) and built to outlive the photographer." Read full review

"This is a nicely-built and attractively-designed lens that is simple to use and delivers nice image quality at a bargain price. This lens may be the ideal gift for a photographer who seems to have everything." Read full review

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"Image quality is very good even on maximum aperture; stopping down improves quality up to f/11. Irix Firefly 11/4 offers  good image quality and features in its price-range (approx. 600€ in Finland)  and features like “Focus lock” and “Infinity click” makes it a solid performer." Read full review

"Through the years i have been able to test different lenses, today thanks to my experiences i can say that the IRIX 11mm Blackstone is a great and unique lens!" Read full review

"When you use the IRIX 11mm f4 Blackstone lens, you’ll realize that it’s pretty difficult to get a bad photo with it. Like pretty much every lens on the market, it’s got good image quality and there is very little to discredit it with when it comes to the image quality." Read full review

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"The Irix 11mm is a fully manual lens. Its focus rig is large, well dampened and fluid. Its range allows precise adjustments at close distances, and easy corrections at longer distances." Read full review

"In terms of image quality, I was pleasantly surprised by the optical performance of this glass. The sharpness in the center is very good even at the widest settings, while the corner resolution improves significantly at f/5.6. Have a little bit of Vignetting and chromatic aberration at f/4 but they also decrease when stopping down the aperture." Read full review

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Specifications

Obiektywy foto

Series Firefly
Mount Pentax K
Focal length 11mm
Sensor size full frame
Maximum aperture f/2.4
Minimum aperture f/22
Filter diameter not applicable
Type wideangle
Apreture blades count 9
Lens composition 11 elements in 9 groups
Minimum focusing distance 0.27m
Focal lenght type prime
Stabilization no
Focus type manual
Rear gel filter slot 30 x 30mm
Weather sealing 3 rubber o-rings
Focus ring distance scale metric
Size (mm) 118 x 103mm
Weight (kg) 0.83

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