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Irix Lens 11mm f/4 Blackstone for Pentax
€335.25 €745.00 Save 55%Lowest price within 30 days before promotion: €335.25The extremely wide-angle, rectilinear manual focus lens designed for DSLR cameras.
Discover the full potential of Irix 11mm f/4 lens with Irix landscape photographer - Robert Pilari.
Buy Irix 11mm f/4 Blackstone and get 60% discount for SNS-HDR software
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.
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.
Blackstone, the Premium version has durable body made with aluminium-magnesium alloy, that ensures foolproof protection of your lens, even in extreme situations. Its construction is equipped with rubber seals, that protect the camera mount and focusing mechanism against the dust and moisture, as well as front or side accidental water splashes. Engraved fluorescent markings enable easy read-out and operation in low light conditions.
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.
Kit includes:
- Irix 11mm f4 Blackstone for Pentax
- lens hood
- front lens cap
- 2 rear lens caps
- soft lens pouch
- metal box
Frequently Asked Questions (FAQ)Find answers to the most frequently asked questions about the Irix 11mm f/4 Blackstone lens for Pentax K.
1. Which cameras is the Irix 11mm f/4 Blackstone for Pentax K compatible with?The Irix 11mm f/4 Blackstone for Pentax K is designed for Pentax K-mount DSLR cameras, including full-frame and compatible APS-C bodies. On APS-C cameras, the field of view will be narrower due to the crop factor.2. What type of photography is the Irix 11mm f/4 Blackstone best suited for?The Irix 11mm f/4 Blackstone is especially well suited for landscape, architecture, interiors, real estate, night sky and creative ultra-wide-angle photography. Its 11mm focal length and 126-degree field of view make it ideal for capturing expansive scenes and dramatic perspectives.3. Does the Irix 11mm f/4 Blackstone have autofocus?No. The Irix 11mm f/4 Blackstone is a manual focus lens. Thanks to electronic communication with the camera, it supports focus confirmation and offers precise manual focusing with Focus Lock and Infinity Click features.4. What is the Focus Lock function used for?Focus Lock allows you to lock the focus ring in a selected position. This is useful when working with a fixed focus distance, the hyperfocal scale, landscape photography or astrophotography.5. What is the Infinity Click mechanism used for?The Infinity Click mechanism helps you quickly and precisely find the infinity focus position, which is especially useful for night photography, landscapes and astrophotography.6. Is the Irix 11mm f/4 Blackstone weather-sealed?Yes. The lens features weather-sealed construction with 3 rubber O-rings that help protect it against dust, moisture and accidental splashes, making it suitable for outdoor work in demanding conditions.7. What is the aperture range of the Irix 11mm f/4 Blackstone?The lens has a maximum aperture of f/4 and a minimum aperture of f/22. It also features a 9-blade rounded aperture design.8. What is the minimum focusing distance?The minimum focusing distance of the Irix 11mm f/4 Blackstone is 0.27 m / 27 cm, allowing close-up shots with an ultra-wide perspective.9. What is the optical construction of the lens?The lens consists of 16 elements in 10 groups, including 4 high refractive elements, 2 ED elements and 3 aspherical elements. This optical design helps deliver sharp images with low distortion for an ultra-wide-angle lens.10. Can filters be used with the Irix 11mm f/4 Blackstone?Yes. The lens has a rear gel filter slot for 30 x 30 mm gel filters. Due to its ultra-wide-angle optical design, it does not use a standard front screw-in filter thread.11. Does the lens communicate with the camera?Yes. The lens supports electronic communication with the camera body, including aperture control from the camera, focus confirmation, semi-automatic PASM modes and EXIF data recording.12. Can the focus of this lens be calibrated?Yes. The lens features a Focus Calibration Window, which allows the focus scale to be adjusted using basic tools if fine-tuning is needed.13. What is the difference between the Blackstone and Firefly versions?Both versions share the same optical design. The Blackstone version has a more robust aluminium-magnesium body, engraved fluorescent markings and a premium finish. The Firefly version is lighter and uses a durable composite construction with a rubberized focusing ring.14. What accessories are included with the Irix 11mm f/4 Blackstone?The Blackstone version includes the lens hood, front lens cap, two rear lens caps, a soft lens pouch and a metal box.
Data sheet
- Mount
- Pentax K
- Type
- wideangle
- Focal length
- 11mm
- Focal lenght type
- prime
- Filter diameter
- not applicable
- Apreture blades count
- 9
- Maximum aperture
- f/4
- Minimum aperture
- f/22
- Sensor size
- FF, FX
- Lens composition
- 16 elements in 10 groups
- 16 elementos en 10 grupos
- 0.27m
- Focus type
- manual
- Stabilization
- no
- Size (mm)
- 118 x 103mm
- Weight (kg)
- 0.8685
- Markings
- laser engraved, UV reactive
- Weather sealing
- 3 rubber o-rings
- Focus ring distance scale
- metric
- Series
- Blackstone
- Focus ring rotation
- 140
- Distortion
- '-3.13%
- Angle of view (degrees)
- 126⁰
- Magnification ratio
- 0.08
"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
"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
"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
"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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