Designed for Nikon F-mount DSLRs, 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.
Designed for Nikon F-mount DSLRs, 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.
Designed for Nikon F-mount DSLRs, 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.
Designed for Nikon F-mount DSLRs, 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.
Last updated at 06/05/2026 02:17:25
Rokinon 20mm f/1.8 AS ED UMC Wide Angle Lens with Built-in AE Chip for Nikon
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Rokinon 20mm f1.8 Nikon E216J6168
Rokinon 20mm F/1.8 Ed As Umc Mf Lens For Nikon F Z-18681
Delivery $82.64
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Guaranteed Very Good Rokinon 20mm F/1.8 Ed As Umc Lens Nikon F 2 Week
Delivery $71.94
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Rokinon 20mm F1.8 Full Frame Wide Angle Lens (micro 4/3)
Delivery $58.96
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Rokinon 20mm F1.8 As Ed Umc Wide Angle Lens For Micro Four Thirds -
Delivery $53.59
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Rokinon 20mm f/18 AS ED UMC Wide Angle Lens with Built-in AE Chip for Nikon - Refurbished - As New
Delivery $15
Rokinon 20mm f/18 AS ED UMC Wide Angle Lens with Built-in AE Chip for Nikon - Refurbished - As New
Delivery $15
Samyang 20mm f/1.8 ED AS UMC for Sony E Mount
Free delivery between 11–18 June
Samyang 20mm f/1.8 ED AS UMC Lens Micro Four Thirds Mount MFT M4/3
Delivery $36.40
originally posted on bhphotovideo.com
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 ... MoreSummary: 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.
originally posted on bhphotovideo.com
Was searching for a high quality (Zeiss, Sigma Art) Prime Wide Angle (18-21mm) for Pentax K-1 with no luck. After reading good reviews, settled for Rokinon 20mm F1.8 (K-1 shows 1.7). Lens is well made, light weight and compact. I see little/no difference in sharpness of same pictures/settings taken with my other camera/lens being Canon 5DM4 w/Canon16-35L F4 IS. I prefer Auto Focus but Manual Focusing via Live View seems to be more accurate. Rokinon was not what I was looking for but has so far has been a pleasant surprise for a lot less!
originally posted on bhphotovideo.com
When I switched from Nikon to Pentax, I knew the one focal length I would have trouble covering is wide angle... Pentax simply doesn't have any full frame wides. The only viable option is the Pentax 15-30mm which is an exceptional lens, but it's expensive and doesn't take filters. I need a relatively inexpensive wide for landscape and long exposure work. The Rokinon has performed really well. Even wide open at 1.8 it was sharper than I expected. At f/5.6 through f/11 it's been fantastic. Corners, edges, mid frame and center have all been great. It's built well (doesn't feel shoddy) and the threads easily take my Formatt-Hitech filter adapter. The one area I haven't tested yet is astrophotography re: coma. The few night shots I have taken so far (with those rare ... MoreWhen I switched from Nikon to Pentax, I knew the one focal length I would have trouble covering is wide angle... Pentax simply doesn't have any full frame wides. The only viable option is the Pentax 15-30mm which is an exceptional lens, but it's expensive and doesn't take filters. I need a relatively inexpensive wide for landscape and long exposure work. The Rokinon has performed really well. Even wide open at 1.8 it was sharper than I expected. At f/5.6 through f/11 it's been fantastic. Corners, edges, mid frame and center have all been great. It's built well (doesn't feel shoddy) and the threads easily take my Formatt-Hitech filter adapter. The one area I haven't tested yet is astrophotography re: coma. The few night shots I have taken so far (with those rare clear skies), the stars looked great, but they weren't near the edge of the frame and I wasn't pixel peeping for coma. Besides, for astro work I'd probably go with the Rokinon 24mm, which is highly regarded for night shooting. Overall I'm borderline thrilled with this lens -- it hasn't left my camera body in the few weeks that I've owned it.
| Focal Length | 20mm |
| Maximum Aperture | f/1.8 |
| Minimum Aperture | f/22 |
| Lens Mount | Sony E |
| Lens Format Coverage | Full-Frame |
Rokinon 20mm f/1.8 AS ED UMC Wide Angle Lens with Built-in AE Chip for Nikon
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Rokinon 20mm f1.8 Nikon E216J6168
Rokinon 20mm F/1.8 Ed As Umc Mf Lens For Nikon F Z-18681
Delivery $82.64
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Guaranteed Very Good Rokinon 20mm F/1.8 Ed As Umc Lens Nikon F 2 Week
Delivery $71.94
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Rokinon 20mm F1.8 Full Frame Wide Angle Lens (micro 4/3)
Delivery $58.96
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
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 ... MoreSummary: 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.
Was searching for a high quality (Zeiss, Sigma Art) Prime Wide Angle (18-21mm) for Pentax K-1 with no luck. After reading good reviews, settled for Rokinon 20mm F1.8 (K-1 shows 1.7). Lens is well made, light weight and compact. I see little/no difference in sharpness of same pictures/settings taken with my other camera/lens being Canon 5DM4 w/Canon16-35L F4 IS. I prefer Auto Focus but Manual Focusing via Live View seems to be more accurate. Rokinon was not what I was looking for but has so far has been a pleasant surprise for a lot less!
When I switched from Nikon to Pentax, I knew the one focal length I would have trouble covering is wide angle... Pentax simply doesn't have any full frame wides. The only viable option is the Pentax 15-30mm which is an exceptional lens, but it's expensive and doesn't take filters. I need a relatively inexpensive wide for landscape and long exposure work. The Rokinon has performed really well. Even wide open at 1.8 it was sharper than I expected. At f/5.6 through f/11 it's been fantastic. Corners, edges, mid frame and center have all been great. It's built well (doesn't feel shoddy) and the threads easily take my Formatt-Hitech filter adapter. The one area I haven't tested yet is astrophotography re: coma. The few night shots I have taken so far (with those rare ... MoreWhen I switched from Nikon to Pentax, I knew the one focal length I would have trouble covering is wide angle... Pentax simply doesn't have any full frame wides. The only viable option is the Pentax 15-30mm which is an exceptional lens, but it's expensive and doesn't take filters. I need a relatively inexpensive wide for landscape and long exposure work. The Rokinon has performed really well. Even wide open at 1.8 it was sharper than I expected. At f/5.6 through f/11 it's been fantastic. Corners, edges, mid frame and center have all been great. It's built well (doesn't feel shoddy) and the threads easily take my Formatt-Hitech filter adapter. The one area I haven't tested yet is astrophotography re: coma. The few night shots I have taken so far (with those rare clear skies), the stars looked great, but they weren't near the edge of the frame and I wasn't pixel peeping for coma. Besides, for astro work I'd probably go with the Rokinon 24mm, which is highly regarded for night shooting. Overall I'm borderline thrilled with this lens -- it hasn't left my camera body in the few weeks that I've owned it.
When I first received this lens, I immediately checked for any optical de-centering, which seems to be a prevalent problem in other Rokinon/Samyang lenses. I was unable to detect any problem. I then compared it to my Canon 17-40mm f/4 zoom at 20mm. At wide open (f/1.8 vs. f/4), the corner sharpness, though not particularly sharp, was better than the zoom. Central sharpness was not dramatically different. When compared at f/4, the Rokinon was clearly better, especially in the corners; but the Canon zoom still put up a good performance except for the extreme corners. While I didn't do a lot of comparisons at smaller apertures, I'd would say it seemed to be pretty much a horse race. Finally, despite a common complaint about the inaccurate infinity setting in other ... MoreWhen I first received this lens, I immediately checked for any optical de-centering, which seems to be a prevalent problem in other Rokinon/Samyang lenses. I was unable to detect any problem. I then compared it to my Canon 17-40mm f/4 zoom at 20mm. At wide open (f/1.8 vs. f/4), the corner sharpness, though not particularly sharp, was better than the zoom. Central sharpness was not dramatically different. When compared at f/4, the Rokinon was clearly better, especially in the corners; but the Canon zoom still put up a good performance except for the extreme corners. While I didn't do a lot of comparisons at smaller apertures, I'd would say it seemed to be pretty much a horse race. Finally, despite a common complaint about the inaccurate infinity setting in other Rokinon lens, this 20mm lens seemed spot on.Now for the caveat. On both my Canon 5D MKII and Canon 5Ds, metering was not accurate. It tended to overexpose at smaller apertures and increasingly underexpose when increasing the aperture (although that behavior wasn't exactly linear). The behavior was the same in either Manual or Aperture Preferred. I found a few similar complaints on the web; but since this is a relatively new lens, there isn't much user experience out there. Also, this may only be a Canon issue. The only theory I can concoct is maybe the metering algorithm, lacking the actual f-number, gets a bit befuddled regardless that it should only care about the actual light entering.I bought this lens only for astrophotography, so the exposure issue doesn't matter to me. For that purpose, I give it a 4-star rating (less one star for the exposure issue). For general photography, the lack of autofocus and potentially an exposure issue, I recommend you spend the extra bucks for a fully automatic lens.
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.
Tested on A7III.Decently sharp at the center, just a bit softer moving to the corners, and heavy vignetting at F1.8. At F2.8, center is razor sharp, extreme corners remain similarly soft to 1.8, and vignetting is much improved. At F4.0, most of frame is razor sharp, extreme corners are much improved and vignetting is more or less gone. It continues to improve all the way to F11 where diffraction sets in, and we know the rest of the story.I like the lens optically except for the heavy vignetting wide open, but the lens is too. flipping. bulky. Its bigger and heavier than the Sony 85mm 1.8 and really just kills the point of having a mirrorless to begin with. Im going back to the Rokinon 12mm F2.0 on my A6300 if I need to go wide for landscapes or astro.
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.
I found this lens to a big surprise. It is very sharp. I take Astro photo and at f1.8 it is very good for the stars. It also is amazing for 4 grounds when like painting. F5.6 f8 are Sigma like sharp.I'm seem us this lens alot . Ibhave a Rokinon sp 14 F2.4 which is also amazing but the 20mm focal lengths I like better . No distortion stall.I'm very happy with this products. No regrets.
I used this lens all day on a Pentax K1. For those who haven't used K-mount Rokinons it acts like an A lens. It gives a nice wide FOV for locations where foot zooming back is not possible. It provided high-contrast and sharp images. I was manual focusing with the illuminated AF pts in the OVF as confirmation. This worked very well and accomplished fine focus. Mostly indoors in ambient light with shutters under 1/20 and SR turned on. Sr worked very well but a 20mm isn't hard to hand hold in any case. I haven't tried landscape or astro-photography yet but I like what I've seen so far.
So far, the Rokinon 20mm lens has proved to be a good performer on my full frame DSLR. It's slightly soft wide open, but it sharpens up quickly and displays no bad behavior. It is surprisingly good optically for being such a fast piece of glass. While manual focus can slow down the task of photography, the camera's focus confirmation light works well. The only knock on the lens is that the 77mm filter size does vignette slightly unless a thin filter is used.
| Focal Length | 20mm |
| Maximum Aperture | f/1.8 |
| Minimum Aperture | f/22 |
| Lens Mount | Sony E |
| Lens Format Coverage | Full-Frame |
