Rokinon 135mm f/2.0 ED UMC Lens for Pentax K Mount

Model: 135M-P

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MSRP: $499.00 ?


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Weight 28.92 oz (820 g)
Dimensions (DxL) Approx. 3.2 x 4.75" (8.13 x 12.06 cm)
Filter Thread Front:77 mm


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
Focal Length 135mm
Comparable 35mm Equivalent on APS-C Format Focal Length: 202.5 mm
Diaphragm Blades 9, Rounded
Aperture Maximum: f/2 - 22
Camera Mount Type Pentax K


Tripod Collar No
Autofocus No
Image Stabilization No
Expert Reviews
The digital picture.34755376
22 July 2016

If you are looking for a value-priced fast telephoto lens, the Samyang 135mm f/2 ED UMC Lens is a good option to consider. At review time, it is the only value priced 135mm f/2 lens available. For a low price, this lens can deliver excellent image quality and imagery that garners attention.

26 July 2016

This manual focus telephoto lens offers a fast f/2 maximum aperture for a price of around £380, which seems very good value for a 135mm lens with an f/2 maximum aperture.

Practical photography.34754171
6 August 2020

Verdict: This lens provides very sharp, manual focus optics. It’s lightweight but feels well-made and durable. It did create very slight vignetting but it’s a great lens for the price.

Practical photography.34754171
14 January 2019

Samyang has been making waves with its latest line of AF lenses, but is primarily known for its range of incredibly sharp, manual focus optics. At 135mm, this lens is firmly in portrait territory, and its wide f/2 aperture returns seriously smooth out-of-focus areas, or bokeh, ideal for creating...

20 March 2015

Those interested in a fast 135mm, who are either on a budget or don’t need autofocus for their work, should certainly consider this lens. It’s more than capable of delivering sharpness on a par with high-end lenses, but at a fraction of the cost.

User Reviews
24 August 2016

This might be the sharpest lens I have used on my A7RII's, shot wide-open, and I have shot all the FE lenses and most of the professional Canon L lenses, as well as a number of Leica lenses, on this camera. The sharpness is stunning! Also amazing is the nearly total lack of LoCA's and CA's.

4 March 2018

I sues this both as a general purpose landscape, portrait and for macro subjects. Even though it is not a purpose-built macro, it is fantastically sharp. Images are contrasty and sharpness carries all the way to the corners when stopped down a little. The focusing ring has the ideal touch and feel.

6 January 2016

This lens is heavy and is manual focus, but it's sharpness is unbelievable! The colors are not the best. When images from this 135mm lens are compared to those produced by most quality Pentax lenses, I'd say the colors from this Samyang lens look slightly duller.

15 May 2018

Inexpensive, well built, but heavy! The weight is a bit daunting on a small APS-C Pentax, but it works. I'm not used to a manual focus lens, but found with live view, image magnification and focus peaking it wasn't too hard to get it right.

27 May 2017

I purchased this lens to take pictures of objects in the night sky that occupy larger areas than my 80mm refractor can see. It is very sharp and the f/2 ratio is great for large dim objects. If the target is brighter, then stopping the lens down to f/4 produces spectacularly sharp pinpoint stars.

Product Highlights
  • 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
Average Expert Score
Average User Score
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
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