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. An included, removable lens hood deters stray light from entering the lens, while protecting it from accidental impact and precipitation. 

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

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

Related Questions and Answers

Q: 1. Can I use this lens on a super 35mm digital camcorder like the Sony FS700?

A: As the Sony NEX-FS700R Super 35 Camcorder uses the Sony E-mount, not the Canon EF lens mount, the above lens would not work for your needs. Instead, you would need to purchase the Rokinon 135mm f/2.0 ED UMC Lens for Sony E MountB&H # RO1352SE, for use on the Sony NEX-FS700R Super 35 Camcorder. Do note this is a fully manual lens, so you will need to set the focal length and aperture on the lens manually.

Q: 2. I am assuming that Nikon D780 is compatible with this lens. Do I need to turn the dial "AF M" of my camera to "M" before I mount this lens? Thanks.

A: You must put the D780 into manual exposure mode to properly operate this lens on it.

Q: 3. Does it have an aperture lever to allow me to focus wide open and have the camera stop it down when I shoot? The picture does not show this.

A: This is a manual lens, both the focus and aperture are controlled on the lens itself. You will be able to adjust the aperture on the lens.

Q: 4. Is this lens compatible with the Canon EOS Rebel T3i?

A: Yes this lens is compatible with the Rebel T3i. Keep in mind that there's a crop factor so the field of view you'll have is a 202mm not 135mm.

Q: 5. Will this lens work on sony a7 mark 11?

A: Yes. It is designed to work well on the A7II or any of the A7 cameras. But the A7II has stabilization and that will make this Rokinon lens even more valuable.

Q: 6. Is this lens compatible with the Nikon D800 and Nikon D5300? On the product page, only D800E is listed.

A: The Rokinon 135mm f/2.0 Lens for Nikon F Mount with AE Chip is compatible with both the D800 and the D5300. Do note that there is a 1.5x crop factor when using this lens on the D5300, so the true focal length will be approximately 202.5mm.

Q: 7. I'm shooting indoor weddings and portraitsbetween the two Rokinon 50mm or 135mm, which lens is best to purchase first?

A: I love my Rokinon 135mm. If you need the reach of the 135, I would recommend getting it. If you feel the equivalent of 200mm full frame is too much then get the 50mm. There is no downside to owning this lens.

Q: 8. Could this lens be good for indoor weddings and portraits?

A: This will be good for lowlight and indoor environments however it is manual focus lens, it may slow you down for weddings and event shoots.

Q: 9. Why does this lens not come with an AE CHIP for Canon?? For traits I'd want the focus beep confirmation and the ability to shift aperture through the camera.

A: Rokinon offer both versions and different price points.

Q: 10. Hi, is this lens compatible with Canon EOS Rebel T7i?

A: Yes, this lens will work on the T7i. Since the mount on the theT7i is an EF mount, you can use it. Keep in mind your T7i is a crop body, so while it will work, the lens will have an effective focal length of (216) on a canon crop body.