Rokinon 20mm f/1.8 ED AS UMC Lens for Sony E

Rokinon 20mm f/1.8 ED AS UMC Lens for Sony E

Rokinon 20mm f/1.8 ED AS UMC Lens for Sony E

B&H # RO2018SE MFR # RK20M-E
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Product Highlights

  • E-Mount Lens/Full-Frame Format
  • Aperture Range: f/1.8 to f/22
  • Two Aspherical and Three ED Elements
  • Ultra Multi-Coating
  • Manual Focus Design
  • Rounded Seven-Blade Diaphragm
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Reg. Price: $599.00

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Rokinon 20mm f/1.8 overview

  • 1Description

Designed for Sony E-mount mirrorless cameras, this 20mm f/1.8 ED AS UMC Lens from Rokinon is a bright wide-angle prime featuring an intuitive manual focus design and enhanced optical construction. Two aspherical elements and three extra-low dispersion elements are used to reduce both spherical and chromatic aberrations for greater sharpness, clarity, and reduced distortion. The optics also feature an Ultra Multi-Coating to guard against lens flare and ghosting for increased contrast and color neutrality when working in strong lighting conditions. The manual focus operation affords working with subjects as close as 7.9" away, and a rounded seven-blade diaphragm contributes to a pleasing bokeh quality.

A wide-angle prime designed for full-frame Sony E-mount mirrorless cameras, this 20mm f/1.8 lens can also be used on APS-C models where it will provide a 30mm equivalent focal length.
Bright f/1.8 maximum aperture benefits working in low-light conditions and also affords greater control over depth of field for selective focus control.
Two aspherical elements are used to reduce spherical aberrations for increased sharpness and minimized distortion.
Three extra-low dispersion elements help to control chromatic aberrations and color fringing for improved clarity and color fidelity.
An Ultra Multi-Coating has been applied to individual elements in order to reduce flare and ghosting for increased contrast and a neutral color balance.
Manual focus operation allows for precise control with a minimum focusing distance of 7.9".
Rounded seven-blade diaphragm contributes to a smooth and pleasing bokeh quality.
UPC: 084438765328
In the Box
Rokinon 20mm f/1.8 ED AS UMC Lens for Sony E
  • Front and Rear Lens Caps
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Rokinon 20mm f/1.8 specs

    Focal Length 20mm
    Aperture Maximum: f/1.8
    Minimum: f/22
    Camera Mount Type Sony E
    Format Compatibility 35mm Film / Full-Frame Digital Sensor
    Angle of View 94.8°
    Minimum Focus Distance 7.87" / 20 cm
    Optical Design 13 Elements in 12 Groups
    Diaphragm Blades 7, Rounded
    Autofocus No
    Filter Thread Front: 77 mm
    Dimensions (DxL) 3.27 x 4.50" / 83.0 x 114.4 mm
    Weight 1.16 lb / 525 g
    Packaging Info
    Package Weight 1.8 lb
    Box Dimensions (LxWxH) 7.2 x 5.2 x 5.1"

    Rokinon 20mm f/1.8 reviews

    20mm f/1.8 ED AS UMC Lens for Sony E is rated 4.0 out of 5 by 4.
    Rated 2 out of 5 by from Not sharp for Astrophotography I shoot with a Sony A7R2. There's no live view with this lens. And there's a hair margin wherein to establish focus on stars. Moreover "focus tracking" on the A7R2 only sort of works with stars. In post processing the stars have "wing tips" and these are not from the periphery of the frame but even in the center. If I want a good pic of the milky way core and don't care about detail this is really great! lol.... All in all, I wish I could return mine and spend more on getting a higher quality lens.
    Date published: 2018-03-29
    Rated 5 out of 5 by from Great lens for astrophotography I bought this lens for wide field astrophotography. I finally tested it with some Milky Way shots this week. The lens is great. There were comments that the lens suffers at 1.8 and 2.0 so I shot at 2.8. I intend to test the more open apertures later. My only 'wishes' are that the lens had the chip to report aperture to the camera and that there were a profile for Photoshop CC.
    Date published: 2018-08-19
    Rated 5 out of 5 by from A great compromise between price and performance. Summary: This lens has good build quality and my copy has even performance across the frame. Sharpness is excellent in the center but falls off towards the edges, those with an A7r may want to look elsewhere. The lens is good for astro at about f/2.8 and makes a good all-around landscape lens. It's a little too big on mirrorless but the lens makes up for it with a great overall performance. I've been in the market for an UWA landscape lens that can double as an astro lens and decided to give this one a try. This was the last lens on my short list of more affordable options, had I not liked this one I would have been looking at Zeiss. I'd like to briefly go over expectations with this lens. The MTF charts posted on Samyang's website for this lens show that it's decently sharp wide open with some astigmatism at the corners. When stopped down the lens does sharpen up but the astigmatism doesn't improve much. This results in softness at the corners stopped down as well as 'wing-tip' aberrations on high-contrast points of light at wide apertures. The 'wing-tip' aberrations disappear when the lens is slightly stopped down. The copy I received has very even performance across the frame and its performance reflects its MTF charts. I was surprised with this as Rokinon/Samyang has a history of making lenses with wild variations in optical performance. A common example is their 14mm 2.8 which has the potential for amazing resolution based on its MTF but because of high build variance it usually falls short of those claims. Of course I could have gotten lucky but I haven't read any reports of high variance with this one. Wide open the lens is very good in the center with the mid-frame and corners falling behind. Stop down to f/2.8 for an increase in contrast and sharpness. It's at this aperture that corner aberrations clear up enough for astro. Stopping down further increases sharpness across the frame but the corners never resolve razor sharp like the center/midframe does, they're at their best at f/8 - f/11. If you use 24mp A7 or 12mp A7s it won't be a huge deal, the softness is only slight and won't ruin a picture. If you're using an A7r you may not like how this lens performs and should instead consider a Zeiss option. Handling and overall build quality is great, though the size could have been smaller. I understand this is a DSLR lens with an E-Mount adapter slapped on but Samyang/Rokinon should consider making a compact line of lenses with a short flange distance for mirrorless. The infinity focus stop seems to be exact or close enough. Overall image rendering is about average - this lens won't blow you away with 3D-like images that Zeiss lenses render but it can produce some nice color. It has a good close-focus distance but it needs to be stopped down to get good sharpness at MFD. Veiling flare resistance is good while ghosting resistance is only OK - it's possible to provoke a small rainbow ghost with the sun in the frame. Sunstars are 14-pointed and are defined by f/11.
    Date published: 2018-09-05
    Rated 4 out of 5 by from Inexpensive Lens Good lens for the cost.
    Date published: 2017-06-20
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    Rokinon 20mm f/1.8 Q&A

    Rokinon 20mm f/1.8 accessories

    Designed for use with:

    • Sony NEX-EA50M
    • Sony PXW-FS5
    • Sony PXW-FS7
    • Sony PXW-FS7M2
    • Sony Alpha A5000
    • Sony Alpha A5100
    • Sony Alpha A6000
    • Sony Alpha A6300
    • Sony Alpha A6400
    • Sony Alpha A6500
    • Sony Alpha A7
    • Sony Alpha A7 II
    • Sony Alpha A7 III
    • Sony Alpha A7R
    • Sony Alpha A7R II
    • Sony Alpha A7R III
    • Sony Alpha A7S
    • Sony Alpha A7S II
    • Sony Alpha A9
    • Sony Alpha a7
    • Sony Alpha A6500
    • Sony Alpha A7S II
    • Sony A7R III
    • Sony NEX-EA50M
    • Sony NEX-EA50UH
    • Sony NEX-FS700R
    • Sony NEX-VG30
    • Sony NEX-VG900
    • Sony PXW-FS5
    • Sony PXW-FS5M2
    • Sony PXW-FS7
    • Sony PXW-FS7M2
    See any errors on this page? Let us know.