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Description
IRIX 11mm f/4 Blackstone Lens for Pentax KPentax K Mount Full Frame Format Aperture Range: f 4 to f 22 Three Aspherical Elements Two ED and Four 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 Distinguished by its refined physical construction, the 11mm f 4 Blackstone Lens from Irix is an ultra wide prime designed for Pentax K mount
- Pentax K-Mount/Full-Frame Format
- Aperture Range: f/4 to f/22
- Three Aspherical Elements
- Two ED and Four 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
Distinguished by its refined physical construction, the 11mm f/4 Blackstone Lens from Irix is an ultra-wide prime designed for Pentax K-mount DSLRs. As a rectilinear lens, the advanced optical layout makes use of aspherical, extra-low dispersion, and high-refractive index elements to control distortion and aberrations for accurate, and sharp rendering with a high degree of clarity and color accuracy. Additionally, a Neutrino coating has also been applied to the lens to control flare and ghosting for improved contrast when working in strong lighting conditions.
Beyond its optical assets, this 11mm f/4 lens also sports 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 11mm f/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.
- Ultra 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 16.5mm equivalent focal length.
- Three aspherical, four 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.
- Built-in petal-shaped lens hood blocks stray light in order to reduce lens flare, and also protects the front element of the lens.
- Rear of the lens accepts 30 x 30mm cut gel filters.
- Rounded nine-blade diaphragm contributes to smooth bokeh.
In the Box
IRIX 11mm f/4 Blackstone Lens for Pentax K
- Front Lens Cap
- Rear Cap for Pentax K-Mount Lenses
- Hard Lens Case (Black)
- %
IRIX 11mm f/4.0 specs
| Performance | |
|---|---|
| Focal Length | 11mm |
| Aperture | Maximum: f/4 Minimum: f/22 |
| Camera Mount Type | Pentax K |
| Format Compatibility | 35mm Film / Full-Frame Digital Sensor |
| Angle of View | 126° |
| Minimum Focus Distance | 10.83" (27.5 cm) |
| Elements/Groups | 16 / 10 |
| Diaphragm Blades | 9, Rounded |
| Features | |
|---|---|
| Autofocus | No |
| Physical | |
|---|---|
| Filter Thread | Rear Gel: |
| Dimensions (DxL) | Approx. 4.65 x 4.06" (118 x 103 mm) |
| Weight | 1.74 lb (790 g) |
| Packaging Info | |
|---|---|
| Package Weight | 3.25 lb |
| Box Dimensions (LxWxH) | 7.4 x 6.0 x 5.8" |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
My dogs think this is either terrifying or amazing
Color: Blue
I got this interactive dog toy thinking it would turn my living room into a fun little chase arena for my two small dogs. Technically, it did create excitement, but not in the way I expected. The toy rolls around unpredictably and wiggles its rope like it is trying to escape, which is honestly hilarious to watch. The movement is surprisingly energetic and the different speed modes keep it from feeling repetitive or robotic. The battery life is decent and it charges quickly, so it is easy to keep it ready for playtime.
Now for the comedy... my one year old Silky Terrier is normally the fearless one. He charges vacuum cleaners, interrogates delivery boxes, and believes he is the head of household security. However, the moment this toy turns on and starts moving, he suddenly remembers he has very important business somewhere else. He will sit at a safe distance and stare at it like it might file a police report against him.
The funny part is that when the toy is turned off, it instantly becomes his favorite object in the house. He happily grabs the rope, drags it around, chews on it, and proudly carries it like a trophy. Apparently his bravery only applies when the toy is not alive. I have discovered that in my house this is considered the acceptable mode of operation.
My seven year old Yorkie is even wiser. She took one look at the moving toy, processed the situation for approximately three seconds, and decided she would absolutely not be participating in whatever nonsense was happening on the floor. She calmly walked away and has maintained that policy ever since. She clearly understands this toy and wants no part of it.
Overall the toy is well made, entertaining, and definitely capable of keeping energetic dogs busy. Even if your dogs end up like mine and treat it as either a suspicious creature or a decorative rope toy, it still provides plenty of entertainment for the humans watching the situation unfold. If your dog enjoys chasing unpredictable moving toys, this one will probably become a household favorite. If not, you may at least get a very funny show out of it. 🐶
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Reviewed in the United States on March 10, 2026
★★★★★ 3
Just another reason to bark.
Color: Blue
I was so excited to come across this Interactive Dog Toy from Mewzoo, figuring that it would be a great way to give our dog some inside exercise during the rainy season that we have in this neck of the woods. It arrives with a charger, instructions and two ropes that can be tied to it, and it took about 2 hours to get it fully charged.
In order to get it moving, one needs to unscrew the blue plastic piece and that gives access to the control inside of it. It has three speeds, but the faster speeds only seem to lessen the time intervals for when it moves, they don't make it move any faster or further. This is kind of a bummer, because it really does not move very far, it mostly just stays within a foot or two of where it started. So not much exercise potential here, unless you consider barking exercise. Barking is one thing we do not need more of in this household, so this toy is a bit of a flop for us. I imagined that our boy might run circles around it and get a bit more hyper, maybe even grab it by the rope and carry it around for a bit. In the beginning I think he was fearful because he just barked at it of it, and then he decided it was time to eat. As you can see in the video, after only a few minutes with it, it looks like he's decided it's just a nuisance, lol.
The concept is good, and the toy itself is reasonably constructed to withstand some playtime. I just think it needs to have more movement and skitter around better to cover more distance. Then again at the whopping price of $10.99, i really can't complain.
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Reviewed in the United States on February 21, 2026
★★★★★ 1
My dog was scared
Color: Blue
It scared my dog, he didn’t like it at all.
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Reviewed in the United States on June 8, 2026
★★★★★ 5
Good interactive toy that keeps even my poodle mix busy
Color: Blue
We have a poodle mix that easily gets bored with most toys, including the other interactive bouncy balls. This toy seems to keep him busy though and so far he has not destroyed it or grown bored of it. The only problem we have is keeping it charged because he seems to wear it out but it is not a problem to recharge it with the USB cable that is included. It is a little tricky screwing the toy back together after charging the battery but I am getting the hang of it. Once it is set to one of the play modes the ropes on top (that you need to put on) will start spinning back and forth and the toy gyrates around seeming like it is alive to our dog. The loves playing with it in all of the modes but I think he likes that faster modes better. It comes with an extra rope which was good because our raptor dog already ripped the first one apart. The price on this toy is relatively low compared to tother toys to I highly recommend this for anyone that has a dog who is bored with the typical play toys.
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Reviewed in the United States on February 22, 2026
★★★★★ 5
Great Enrichment Toy for Treats or Kibble!
Color: red
I love this toy—and so do my dogs! It’s perfect for daily enrichment and works great as a kibble feeder too. It holds a generous amount (about 3 cups), rolls smoothly, and keeps my dogs mentally engaged while they work for their food.
One of my favorite features is the adjustable treat holes. You can easily change the difficulty level, which makes it suitable for dogs of all sizes and skill levels. Whether you have a beginner or a more experienced puzzle solver, this toy adapts perfectly.
It’s well-made, easy to clean, and durable enough for everyday use. This has been a great addition to our routine and helps slow down eating while keeping my dogs entertained and stimulated. Highly recommend for anyone looking to add more enrichment to their dog’s day!
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Reviewed in the United States on January 22, 2026