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Description
Rokinon 135mm f/2.0 ED UMC Lens (Pentax K)Pentax K Mount Lens Full Frame 202. 5mm (35mm Equivalent) Aperture Range: f 2. 0 to f 22 One Extra Low Dispersion Element Ultra Multi Coating Manual Focus, Manual Aperture Ring Minimum Focus Distance: 2. 6' Filter Thread Diameter: 77mm Removable Lens Hood Rounded 9 Blade Diaphragm The 135mm f 2. 0 ED UMC Lens for Pentax K Mount from Rokinon is a manual focus telephoto prime lens useful for portraiture and all medium telephoto applications. Its fast f
- Pentax K Mount Lens/Full Frame
- 202.5mm (35mm Equivalent)
- Aperture Range: f/2.0 to f/22
- One Extra-Low Dispersion Element
- Ultra Multi-Coating
- Manual Focus, Manual Aperture Ring
- Minimum Focus Distance: 2.6'
- Filter Thread Diameter: 77mm
- Removable Lens Hood
- Rounded 9-Blade Diaphragm
The 135mm f/2.0 ED UMC Lens for Pentax K Mount from Rokinon is a manual focus telephoto prime lens useful for portraiture and all medium telephoto applications. Its fast f/2.0 maximum aperture is effective in low light and enables shallow depth of field control. With a rounded 9-blade diaphragm, shallow depth of field imaging will be rendered with pleasing out-of-focus highlights. On Pentax APS-C format DSLRs the lens provides a 35mm focal length equivalence of 202.5mm. Its minimum focus distance is 2.6'.
The optical design includes one extra-low dispersion lens element to control chromatic aberration, contributing to sharp, color-accurate imaging, and each of its lens elements features Ultra Multi-Coating to improve light transmission and reduce ghosting and flare. An internal focus system prevents the front end from rotating which allows more effective use of variable filters.
A durable metal barrel with a wide focus ring and manual aperture control ring offer tactile control over focus and exposure. A n included, removable lens hood deters stray light from entering the lens, while protecting it from accidental impact and precipitation.
- Manual focus prime lens for portraiture and general telephoto applications
- One extra-low dispersion (ED) lens element reduces chromatic aberrations
- Ultra Multi-Coating (UMC) on the lens elements minimizes ghosting
- Non-rotating filter mount
- Removable lens hood
- This lens features a mechanical aperture coupling that permits the use of aperture priority and automated exposure modes, as well as the ability to control the aperture setting with Pentax DSLRs
UPC: 084438764161
| Performance | |
|---|---|
| Focal Length | 135mm Comparable 35mm Equivalent on APS-C Format Focal Length: 202.5 mm |
| Aperture | Maximum: f/2 - 22 |
| Camera Mount Type | Pentax K |
| Format Compatibility | 35mm Film / Full-Frame Digital Sensor Pentax Digital (APS-C) |
| Angle of View | 18.8° APS-C Picture Angle: 12.4° |
| Minimum Focus Distance | 2.6' (.79 m) |
| Elements/Groups | 11/7 |
| Diaphragm Blades | 9, Rounded |
| Features | |
|---|---|
| Image Stabilization | No |
| Autofocus | No |
| Tripod Collar | No |
| Physical | |
|---|---|
| Filter Thread | Front: 77 mm |
| Dimensions (DxL) | Approx. 3.2 x 4.75" (8.13 x 12.06 cm) |
| Weight | 28.92 oz (820 g) |
| Packaging Info | |
|---|---|
| Package Weight | 2.45 lb |
| Box Dimensions (LxWxH) | 8.0 x 5.2 x 5.2" |
In the Box
Rokinon 135mm f/2.0 ED UMC Lens (Pentax K)
- Lens Hood
- Front Lens Cap
- Rear Lens Cap
- Carry Pouch
- Limited 1-Year Warranty
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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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
4.2 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Good for night sessions
Size: Medium, Pattern Name: Pack of 1
Picked this up for evening fetch sessions and it’s been a win. It charges up fast, couple minutes under a lamp or in sunlight and it’s good to go, and the glow is genuinely bright, not the sad dim purple some of these put out. Makes it way easier to find in the yard at dusk, and the dog can actually track it.
It’s a little on the softer side compared to a regular tennis ball, but durable enough to hold up to my big dog, who is not gentle with toys. Still kicking after plenty of chomping and slobber. Fits a standard Chuckit! launcher perfectly, which is the whole point.
Pros:
• Glows brightly and clearly in the dark
• Charges fast from any light source
• Holds up well even with a big, enthusiastic chewer
• Fits standard ball-throwing sticks
• Great for evening or early-morning fetch
Cons:
• A bit softer than a regular tennis ball — a determined power-chewer could probably destroy it eventually
• Glow fades after a while, so you’ll need to recharge it during long sessions
• Only glows if it’s been charged, which is obvious but easy to forget
Tips:
• Charge it under a bright light or in the sun for a few minutes before heading out
• A flashlight works in a pinch if you forgot to charge it
• Keep it out of permanent fetch duty — rotate with a regular ball so it lasts longer
• Not a chew toy, even though it’s tempting to leave it with the dog
Five stars. If you’ve got a dog and a yard, this makes evening fetch actually doable.
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Reviewed in the United States on May 24, 2026
★★★★★ 5
Westies Fav
Size: Small, Pattern Name: Pack of 1
Best Westie ball ever, my dog loves this ball. Exactly her size! 3" tennis balls are too big & she rips the fur off. this silicone-ish ball has no fur & is 2&1/2 "
We have 2" balls from her electronic ball laucher, but she still loves this glow in the dark best!
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Reviewed in the United States on May 4, 2026
★★★★★ 5
Best dog ball in the world!
Size: Large, Pattern Name: Pack of 1, Size: Large, Pattern Name: Pack of 1
My dog is singularly obsessed with playing ball. He would drop a steak to chase a ball. (He'd return to the steak, but not without the retrieved ball. He's not an idiot.) He makes dangerous leaps, crashes into trees, and runs fast enough to catch thrown balls before they even hit the ground. Since he doesn't care about his own wellbeing, it's my job to protect him as much as I can. And a lot of balls are hard enough to cause him pain or dental damage when he mistimes a catch. Enter the ChuckIt Glow Ball!
The minute Cowboy got his first Glow Ball, he no longer had any interest in the dozens of tennis balls scattered around the house and yard. If I took the Glow Ball away and instead threw a tennis ball, Cowboy would run to retrieve the ball, then return without it and begin looking all over the house for the Glow Ball. The Glow Ball is tough enough to survive Cowboy's big, sharp chompers, yet it's soft enough to do no harm when it hits him in the face. The glow feature is a huge bonus, too. Cowboy gets distracted by chipmunks and squirrels when we're playing, so he sometimes can't remember where he dropped the ball to pursue the interloper. If the ball was exposed to enough light before it was misplaced, it will be easy to find once the sun goes down. (Otherwise, Cowboy always finds it eventually.) When I'm feeling nocturnal, I'll put the ball under a light for a few minutes to activate the electrons, then treat my boy to a middle-of-the-night game of fetch.
I was so happy to see these on sale, I bought a lifetime supply for my pantry. The size guide seems accurate. ChuckIt recommended the large size for a dog of Cowboy's weight and that size is perfect. Highly recommended product.
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Reviewed in the United States on October 14, 2024
★★★★★ 5
Perfect for Blind Dogs, Fun and Durable
Size: 2-pack, Style: Duo
My blind dog loves these Chuckit! sniff balls. She can easily sniff them out and plays fetch with them for 20 minutes a day, even running up and down the stairs.
The balls are durable, bounce well, and the bacon and peanut butter scent keeps her engaged. I do wish Chuckit! would bring back the version with a tone so we could play fetch outside more easily.
Overall, a fantastic toy for dogs that rely on scent and a fun way to keep them active.
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Reviewed in the United States on February 14, 2026
★★★★★ 5
My Golden Loves
Size: 2-pack, Style: Duo
My 8 month old Golden Retriever loves these. It is also one of the few products she cannot destroy. They smell as described and she loves to chew them and play fetch when. She can chew these easily without destroying them. Overall good value for the money for my Golden
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Reviewed in the United States on January 2, 2026
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