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Sigma 20mm f/1.8 EX DG : Specifications and Opinions


Sigma 20mm f/1.8 EX DG

The Sigma 20mm f/1.8 EX DG is a wide-angle lens for FF and APS-C, manufactured from 2002 to 2015 (discontinued). The focus is done by Lens AF motor (non-ultrasonic), it does not have image stabilization. The average price, when it has been added to the JuzaPhoto database, is 600 €;
17 users have given it an average vote of 8.8 out of 10.


If you have used this item, you can add your vote:  


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 Specifications
 Focal lenght   20 mm
 Angle of view   94.5°
 Format   FF, APS-C
 Max. aperture   f/1.8
 Aperture blades   9
 Lenses/Groups   13 elements in 11 groups
 Min. focus distance   0.20 meters
 Reproduction ratio   0.25x

 Features
 Stabilization   No
 Focus   Lens AF motor (non-ultrasonic)
 Internal AF   No
 Full Time MF   No

 Built and notes
 Tripod ring   No
 Extenders   No
 Filters   82 mm
 Lens hood   Yes, supplied
 Weather sealing   No
 Weight   520 g
 Dimensions   89 x 90 mm

 Buy

Sigma 20mm f/1.8 EX DG, buy on Ebay Ebay



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Reviews



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avatarsupporter
sent on May 08, 2014

Pros: Unique spec, closest focus, fastest in class

Cons: 82mm filters, odd push-pull AF/MF selector, old style focus, Expensive - for its quality. Overshadowed by new Nikkor G 20mm f1.8

Opinion: This lens has two separate uses for me: Street capture - use at f2 and take off the hip. Great for wideangle industrial documentary style shots. The lens is sharp in the centre at f2, the edges much less so, which is often OK for this style of shooting. Landscapes - stop down to f4 and beyond and then it's as sharp as the competition and performs much more evenly across the frame. Distortion is low. Big 82mm filters make polarisers expensive. Handling and balance on the camera is good though the odd push/pull MF/AF selector is a nuisance. The lens also uses old Sigma AF technology, screw-driven and not HSM, but in the field for street stuff, it works OK on my D700 and D7000. The close focus might seem a gimmick but a really useful one - see my snowdrops entry. Recommended? Probably not - and only then for FX full-frame; it is expensive and quite big - Nikon's 20mm D f2.8 is pocket-sized and uses only 62mm filters. However, its unique spec is certainly intriguing and the performance isn't always the disaster it might be made out to be, if used within its limitations. Those with the money will have to sacrifice slight angle of view and splash out for the Nikkor G 24mm f1.4, to get the best quality. And now, (edit) the brand new Nikkor G 20mm f1.8 which has obviously copied the this Sigma's specification. My score 8/10

Google Translate  The following opinions have been automatically translated with Google Translate.


avatarjunior
sent on July 22, 2021

Pros: Very bright, interesting bokeh, good color rendering, sturdy construction

Cons: Not very clear at f/1.8, autofocus that must be calibrated with care, uncomfortable and anachronistic AF/MF selection, availability of the hood

Opinion: Purchased used (Pentax-K mount) at an attractive price, it lends itself well to environments with low light and in general for somewhat "creative" shots, as long as you do not expect a stratospheric image quality, especially at the most open apertures. At full aperture the sharpness is discreet in the center but really poor at the edges, to get good results on the whole frame you have to close at f / 8. It must be said that diaphragm already at f/2 in the center improves a lot. I often use it between f/2 and f/2.8, and taking advantage of the minimum focus distance of about 20 cm, you can get very special photos, also thanks to a soft and gradual bokeh. Surely the large aperture requires you to calibrate the autofocus carefully through the fine adjustment "in-camera", otherwise focusing on the wrong point is a moment. Still on the subject of autofocus I emphasize, in addition to a certain slowness, the inconvenience of the AF / MF passage, which betrays the age of the lens. The large diameter of the front lens (82 mm) means that you have to spend a lot on a basic set of filters, luckily I already had those for the Pentax 24-70 f/2.8, which has the same diameter. Finally I point out that I was sold without a hood, and that this is really difficult to find. You can fix it with that for the 24-70 f/2.8 of Sigma, but of course you have to know... Rating 7

avatarjunior
sent on June 04, 2021

Pros: Street, events, portraits, interiors.

Cons: Poor sharpness already in the center, even worse at the edges.

Opinion: Bought new with Pentax frame, to do multi-evening installations, via Lattea and similar, however landscape in general, at a really ridiculous price, I put it to the test to diaphragms between f5.6 and f11 just to keep it nice sharp on my K-1 that in detail pulls out a lot, in the village of Bobbio, in the afternoon and at the blue hour. Needless to say, for what I was doing, it was not good and I resold it the next day at 20€ less so much the shame of proposing such a poor optics ... at least to make landscapes. Its opening can be useful indoors: birthdays, parties, events, nothing more. Maybe in crop on apsc it definitely goes better, no on full-frame.

avatarjunior
sent on December 28, 2018

Pros: Realisation, sharpness, F 1.8

Cons: AF not always accurate, dual selection for AF/MF

Opinion: Now I have this lens for a year, I find it a spectacular travel companion: the diameter of the filter holder 82mm allows you to use the systems 100mm without reductions. Also I find that it is very sharp and the F 1.8 together with the minimum focus of 20cm from huge photographic possibilities. The only flaw is the AF being a technology not just first coat is inaccurate and slow and sometimes fails to focus, at the beginning I found laborious the selection of the focus mode but once used not by problems. I use it on both Canon and Sony with excellent results.

avatarjunior
sent on September 14, 2016

Pros: Minimum focusing distance 200mm, precise and fast AF with normal sharpness especially light in the center that helps in some ways blurred.

Cons: Filters a bit 'expensive.

Opinion: Valid for use 20mm x street / documentaries and views, not bad in ravvicinati.rnCon excellent portraits of focusing distance, about 20cm. you may also have fine details in partial immagine.rnSi use comfortably in both FF formats APS-C.rnA my humble opinion, a good compromise if used within its limits (which however also have other wide angle). well built I would say, in use you'll immediately notice that it is not plasticky and yet that feeling solid. In well-built complex, I would definitely recommend giving it a rating of 9/10.




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