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Date: 23/11/2016 | By: Heather

Samyang-Rokinon 50mm f/1.4 Autofocus Review for Sony E-mount


Samyang-Rokinon 50mm f/1.4 Autofocus Review for Sony E-mount

Samyang-Rokinon is a leader in the production of high quality, affordable manual focus lenses for digital cameras, so it came as a surprise when the brand announced not one, but two autofocus lenses for Sony E-mount this year: the wide-angle 14mm f/2.8 and the standard 50mm f/1.4, the latter of which is the subject of our review today.

In all honesty, what intrigued me even more than the brand’s debut on the autofocus scene was its decision to give its first AF lenses to the E-mount rather than the more established EF and F mounts from Canon and Nikon respectively. Though I’m sure autofocus lenses for DSLRs will come in the near future, I take this move as a sign that Samyang-Rokinon, like many other third-party lens manufacturers, has great faith in the continued success of the E-mount.

So, what about the 50mm f/1.4 AF itself? Is it a lens worthy of the E-mount and can it complete with Sony’s own 50mm offerings, of which there are already four? Let’s find out!

Main specifications

Samyang AF 50/1.4 FE

  • Mount: Sony E-mount
  • Format coverage: 35mm
  • Focal length: 50mm
  • Aperture range: f/1.4 – 16
  • Aperture blades: 9
  • Lens groups / elements: 8/9
  • Angle of view: 47° (full-frame), 31.4° (APS-C)
  • Minimum focus distance: 0.45m
  • Filter diameter: 67mm
  • Optical stabilisation: none
  • Weight: 585g
  • Length: 97.7mm

Ethics statement: We were provided with a sample of the Samyang-Rokinon 50mm f/1.4 AF to test on our Sony A7r II. We were not asked to write anything about the lens in exchange for the opportunity and were not provided any other compensation of any kind. All opinions we express regarding the 50mm are our own. Within the article, there are affiliate links. If you buy something after clicking the link, we will receive a small commission that helps support the site. Don’t worry – prices remain the same for you. To know more about our ethics, you can visit our full disclosure page. Thank you!

Design and Ease of Use


The first thing you’ll notice is that the 50mm f/1.4 is quite a large and heavy prime lens, so much that it overwhelms the smaller APS-C series. If you compare it to the Sony 55mm, for example, you can see it is twice the size and weight (although to be fair, the latter has a 1.8 aperture). For this reason, I’d only recommend using it on Sony’s full-frame cameras or perhaps the new a6500 which has a larger grip.

Though it has a solid metal construction, it isn’t dust or moisture resistant.

The barrel is sparsely populated, with no aperture ring, distance scale, depth of field scale or physical controls. There is, however, a large fly-by-wire focus ring whose textured surface makes it easy to grab and turn.


The lens comes with a plastic petal-shaped lens hood that makes the lens look even larger than it actually is, but combined with the UMC Super multi-layer coating on the front element, it does an excellent job of mitigating flare and ghosting. In fact, during our entire testing period, we didn’t come across a single example of flare despite having shot directly into the sun multiple times.


The lens also features a 67mm filter thread, so you can easily attach ND filters such as the Lee Seven5 filter set to create long exposures.


Optical quality – Through the lens

samyang rokinon 50mm f/1.4 af
A7r II, 1/640, f/5.6, ISO 200
A7r II, 1/2500, f/2.8, ISO 200

The Samyang-Rokinon 50mm has an aperture range of 1.4 to 16, making it one of the fastest standard primes for the E-mount.

Though f/1.4 is the softest aperture, I still find it usable. Stop down to any value between f/1.6 and f/2 and you’ll notice an improvement. The best results can be achieved between f/2.8 and f/8, and peak sharpness occurs at around f/5.6. By f/16 you will start to notice some diffraction. This applies to both short and long distances.

Reference image
Reference image
100% crops showing sharpness at all apertures. Click to see a larger version.

Achieving a shallow depth of field with the Samyang is easy thanks to its fast 1.4 aperture.

A7r II, 1/4000, f/1.4, ISO 200

The specular highlights are round and uniform at the centre, only becoming more oval shaped at the edges and in the corners. The more you stop down, the more uniform they become.

A7r II, 1/125, f/2.8, ISO 2500
A7r II, 1/125, f/2, ISO 3200
Specular highlights between f/1.4 and f/4. Click to see a larger version.

As for the out-of-focus rendering, it is pleasing to the eye at the fastest apertures thanks to the smooth and natural transitions between elements. The lens’ ability to separate the subject from the background is also very good.

A7r II, 1/200, f/1.7, ISO 800
A7r II, 1/200, f/2.5, ISO 100
A7r II, 1/1250, f/1.4, ISO 200
A7r II, 1/80, f/1.4, ISO 100

Chromatic aberration is present up until around f/4 and it can be quite invasive at the fastest apertures. While much of it can be eliminated in Lightroom with the dedicated lens profile and chromatic aberration removal tool, you may find that some stubborn traces remain.

Longitudinal chromatic aberration can be seen along the figurine’s hairline. Click to see a larger version.
Purple fringing at f/1.6
Purple fringing at f/1.6

Some very minor barrel distortion and heavy vignetting is also present but if you shoot in RAW format, it can be easily removed with the dedicated profile in Lightroom. If you usually shoot OOC JPGs, make sure that all the lens corrections are turned to Auto in the camera menu so that they too get corrected.

Below you can see the corrected and uncorrected versions of the same shot taken at f/1.4. Slide to the right to see the version without the lens profile, or to the left to see the version with the profile applied.

Autofocus Performance

Considering that this is one of Samyang’s first autofocus lenses, I found the performance very good overall.

In single and continuous autofocus for stills, it locks onto the subject fairly quickly but isn’t quite as fast as a native Sony lens. For video, it is quick in good light but takes more time to change the focus point in poor light conditions.

Below you can see a burst taken in C-AF with the a6300 of Mathieu running towards me. While most shots are in focus, the camera loses track of the subject near the end of the burst. (Note that Mathieu had not yet reached the minimum focus distance of the lens, which is 45cm.)

Green = in-focus | Red = out-of-focus
Green = in-focus | Red = out-of-focus

The biggest disappointment is its noisy autofocus mechanism for stills in AF-S, AF-C and MF modes. It is clearly audible in very quiet places, which defeats the purpose of having a camera with a silent electronic shutter.

Sexy AF noise 😀 😀 #samyang50mm14af

A video posted by H. Broster & M. Gasquet (@mirrorlessons) on


A7r II, 1/400, f/8, ISO 200

I’m glad that Samyang-Rokinon has ventured into the world of autofocus lenses. For a first attempt, I feel they’ve done a good job with the 50mm f/1.4 but there is still some room for improvement, especially concerning the noisy autofocus mechanism. It may annoy video shooters in particular because the noise is audible in your footage.

Another point to consider is the size and weight of the lens. While it is a good match for Sony full frame cameras, it tends to overwhelm cameras in the APS-C range.

Otherwise, the lens delivers where it counts: it has good overall optical quality, a fast maximum aperture and reasonably quick autofocusing, and is attractively priced at around $700, which is about half the price of the Sony Zeiss 50mm f/1.4 equivalent.

A7r II, 1/1000, f/4, ISO 200

thumb-up What I like about the Samyang-Rokinon 50mm f/1.4 AF

  • features a solid metal build with a comfortable focus ring
  • a very pleasant bokeh with a creamy out-of-focus rendering and round specular highlights
  • great sharpness through most of the aperture range
  • the fastest aperture values help you to you work in poor light and achieve a very shallow depth of field
  • already comes with a dedicated lens profile in Lightroom
  • competitively priced compared to other E-mount 50mm primes with similar specifications

thumb-down What can be debated about the Samyang-Rokinon 50mm f/1.4 AF

  • the fastest aperture of 1.4 is a bit soft but this is to be expected from such a fast lens, and the performance improves as soon as you stop down to 1.7
  • autofocus performance isn’t quite as fast as Sony lenses but is still quick

thumb-down What I don’t like about the Samyang-Rokinon 50mm f/1.4 AF

  • too big and heavy for Sony APS-C cameras
  • noisy AF mechanism for stills and video in AF-S, AF-C and MF modes
  • lots of chromatic aberration up to f/4 that can sometimes be difficult to remove
  • no weather-sealing

Check price of Samyang-Rokinon 50mm f/1.4 AF at B&H Photo

About the author: Heather Broster

Heather Broster was born in Canada, has lived in Japan and Italy but currently calls Wales home. She is a full-time gear tester at MirrorLessons. You can follow her on Google+, Twitter or Facebook!

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