Sigma

Sigma 20mm f/1.8 EX Aspherical DG DF RF AutoFocus Super Wide Angle Lens with Hood for Sigma Cameras - USA Warranty

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About Sigma 20mm F/1.8

Sigma 20mm f1.8 EX DG Aspherical RF is one of several EX Series lenses. It is the first 20mm Super wide-angle lens in the world with a large aperture of F1.8 and angle of view 94.5°. It has Macro focusing capability with a minimum focusing distance of 20cm/7.9inches (reproduction ratio 1:4). The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates an aspherical lens element in the front as well as rear lens groups, to minimize distortion, spherical aberration and astigmatism. The lens has non-vignetting optical construction, in order to obtain adequate peripheral brightness with open aperture. This is especially desirable for digital cameras. The lens incorporates a rear focus system eliminating front lens rotation, thus allowing the use of a Perfect Hood and easy use of polarizing filters. The lens also incorporates dual-focus mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. The lens materials used in this lens are lead and arsenic free ecological glass.

Sigma 20mm F/1.8 Specifications

Construction
11 groups /13 elements
Angle of view
94.5°
F stop range
22
Closest Focusing Distance
20cm / 7.9"
Maximum Magnification
1:4
Filter Size
82mm
Dimensions (Length x Diameter)
88.5 x 87mm / 3.5 x 3.4"
Weight
520g / 18.3oz.
Mfr #
411110
SKU
SG2018SG

Sigma 20mm F/1.8 Reviews Powered by TurnTo®

Review Snapshot®

 
3.9

(based on 25 reviews)

68%

of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars

     

    (11)

  • 4 Stars

     

    (9)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (4)

Most Liked Positive Review

 

Sigma 20mm f/1.8 EX Aspherical DG DF RF

Very Sharp lens at the optimal apetures f/8-f/16 very good at f/7 f/5.6, good at f/4...a bit soft at f/1.8-f/2.8 and f/22, better at f/3/5-f/4. It's a heavy big lens solidly built but does the job. Works using infrared with no to min. hot spot when shooting towards the light source. Good close up feature with manual override switch and large focus ring.

VS

Most Liked Negative Review

 

Does not produce crisp photos

I really can't think of anything good to say about this lens. After much research I decided to buy this lens. I saw a few reviews that said it was blurry, but there were considerably more good reviews. I tried the lens in a very well lit situation and it appeared to be crisp and clean on my LCD. When I downloaded the images to my computer and looked at the print size of the images they were all soft and blurry. Details like lips and eyes were undefined. The other thing I noticed was the len...

View full Review

I really can't think of anything good to say about this lens. After much research I decided to buy this lens. I saw a few reviews that said it was blurry, but there were considerably more good reviews. I tried the lens in a very well lit situation and it appeared to be crisp and clean on my LCD. When I downloaded the images to my computer and looked at the print size of the images they were all soft and blurry. Details like lips and eyes were undefined. The other thing I noticed was the lens had issues in auto focus, it wouldn't pick-up certain focal points and would keep searching for focal points. I should mention I am a professional photographer that has worked with a few good lenses and if you are a professional this lens will not be good enough. Stick with Canon their lenses were designed for their focusing system. I agree they are way over-priced, but I suppose that its worth it in the long run!

Reviewed by 25 customers

 
5.0

Very nice lens.

By

Specifically wanted a large F stop lens for night photography of stars on our up coming trip out west. This lens filled the bill. Reasonably priced and it does Macro very well. Goes well with my two other Sigma telephoto lenses.

 
3.0

surprisingly sharp - forget for astro

By

The lens is surprisingly sharp (especially in the center). But due to the severe coma I found it useless for night photography involving pinpoints of light (e.g. stars, distant lights). I would suggest that its best usage to be portraits and interiors.

 
4.0

Mine was not focussing in AF...

By

I ordered this lens from Adorama a week ago and I immediately discovered that it would only provide sharp focus in live view -- "normal" AF was always out-of-focus at all focal lengths. Attempted to use Reican FoCal but it could not obtain focus either. Manually trying -5, -10, -15, and finally -20 revealed that no amount of fine tuning could fix the lens. I decided to send it off to Sigma instead of returning it to Adorama. Sigma support turned it around right quick and now it focuses AF properly both through the viewfinder as well as live view with the caveat that I had to set micro fine tune all the way to -20, leaving no "wiggle room". Aside from this annoying fact, the lens is killer at f/2.8 and produces acceptible results at f/1.8 which I intend to use for shooting the milky way. I would describe its bokeh as "fussy" -- definitely not "creamy". Auto focus speed is more than acceptible. Love the "look" it delivers at just 8" from the subject. BTW, I use DxO Optics Pro as the RAW converter and all distortion is eliminated using this software. This lens is nice complement to my 24-120mm f/4 which is my primary "go to" lens.

 
5.0

better than the nikon

By

I shoot on a nikon d800 and I used the nikon 20mm 2.8 for over a year in nightclubs and music festivals. I bought the sigma for the sole reason of having a larger aperture, however, the image quality on the sigma is FAR better than the nikon. Build quality is a little plasticy but that's too be expected these days, it's not "too" plasticy by any means. Focus ring is smooth and buttery, bokeh, amazing, image quality, sharp. All around great and better than the nikon! Autofocus is "normally" fast, nothing amazing or slow about it. Highly reccomend this over the nikon.

 
5.0

solid used product

By

This lens is sharp and clean. I think it was an E on the Adorama rating list but I would give it a higher marking. Very clean and well kept.

 
5.0

It's glued on my Nikon D7000!!!

By

I love this lens, and it works perfectly well with my Nikon D7000 and never did I ever encounter any issues with it. I use primes, and it was with this lens that got me started in building my f/1.8 lens line-up. Starting with this 20mm, followed by the 28 sigmas. Then the Nikkors 35, 85, and a manual focus Nikkor 105mm, all in f/1.8!!!

 
4.0

Sigma 20mm f/1.8 EX Aspherical DG DF RF

By

Very Sharp lens at the optimal apetures f/8-f/16 very good at f/7 f/5.6, good at f/4...a bit soft at f/1.8-f/2.8 and f/22, better at f/3/5-f/4. It's a heavy big lens solidly built but does the job. Works using infrared with no to min. hot spot when shooting towards the light source. Good close up feature with manual override switch and large focus ring.

 
1.0

Does not produce crisp photos

By

I really can't think of anything good to say about this lens. After much research I decided to buy this lens. I saw a few reviews that said it was blurry, but there were considerably more good reviews. I tried the lens in a very well lit situation and it appeared to be crisp and clean on my LCD. When I downloaded the images to my computer and looked at the print size of the images they were all soft and blurry. Details like lips and eyes were undefined. The other thing I noticed was the lens had issues in auto focus, it wouldn't pick-up certain focal points and would keep searching for focal points. I should mention I am a professional photographer that has worked with a few good lenses and if you are a professional this lens will not be good enough. Stick with Canon their lenses were designed for their focusing system. I agree they are way over-priced, but I suppose that its worth it in the long run!

 
1.0

Sorry, not a good lens

By

This lens is only semi sharp at f/8, so if you need some lens sharper in lowlight this is not the choice. Otherwise, right side is almost always blurry. I send the lens to Sigma to calibrate and it returns the same.

(5 of 5 customers found this review helpful)

 
1.0

Not for my D7000

By

This lens won't even allow my D7000 to power up. It seems to work on some older bodies, but I'm sending it back, since it's useless to me.

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