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Sigma 20 mm f/1.8 EX DG Aspherical RF

Pictures:
Specifications:
Manufacturer Sigma
Model 20 mm f/1.8 EX DG Aspherical RF
Lens style Wide angle
Focal length 20 mm
Maximum aperture f/1.8
Angle of view 94.5 o
Closest focusing distance 0.2 m
Maximum magnification 1:4
Minimum aperture 22
Number of diaphragm blades 9
Auto focus type AF
Lens Construction 13 elements / 11 groups
Filter diameter 82 mm
Macro No
Available mounts Canon EF
Nikon F
Sony A / Minolta
Sigma
Pentax K
Dimensions 88.5 x 87 mm
Weight 520 g
Additional information
Average rating (11 owners reviews)
Build quality
Optical quality
Value for money

Overall

3.82 Average
Owners reviews (11)
  1. doracapi
    doracapi 23 December 2015, 20:33
    Build quality
    Optical quality
    Value for money

    Overall

    IP 94.53.x.x
    Owner since: 1 year
    Price:
    User profile: Amateur

    Cons: very soft from f1,8 to f2,8, small CA,

    Pros: sharp from f4 to f8,nice bokeh,good AF,contrast and colours,good for close up, fast f 1,8

    Summary: Good for landscapes and close up.

  2. lensreporter
    lensreporter 1 March 2013, 15:39
    Build quality
    Optical quality
    Value for money

    Overall

    IP 95.63.x.x
    Owner since: 1 year
    Price: 300€
    User profile: Semipro

    Cons: a bit weavy distorsion, between f1.8-2.4 soft corners, AF on the sow side

    Pros: very sharp stopped down, as well good corners with my Nikon D 700, good lowlight performence, only very few CAs

    Summary: I have been reading some stupid and wrong comments here or the guys had bad lack with a bad copy. My copy simply is fine giving great results! For the money a great deal!

  3. trautwyn
    trautwyn 27 February 2013, 15:19
    Build quality
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    Value for money

    Overall

    IP 193.22.x.x
    Owner since: 3 years
    Price: 600 Euro
    User profile: Amateur

    Cons: quite huge for the focal length 82mm filters

    Pros: fastest 20mm lens

    Summary: I like it for low light shooting on DX. Teams very nice with 35/f1.8 or 50/f1.8. Only drawback is the size and weight.

  4. Tor
    Tor 12 May 2012, 12:51
    Build quality
    Optical quality
    Value for money

    Overall

    IP 84.49.x.x
    Owner since: 1 year
    Price: 4500 nkr
    User profile: Amateur

    Cons: Almost useless wide open (Soft) Sigma's quality control has a bad reputation.

    Pros: Being special. Close focus combined with wide angle is cool! Works fine for me when stopped down a bit.

    Summary: A special purpose lens in my bag. I use the great Tokina 11-16/2.8 for most wide angle, but when you need to get very close to something smallish and put it in a wide perspective, this is it!

  5. amateur666
    amateur666 4 February 2012, 15:54
    Build quality
    Optical quality
    Value for money

    Overall

    IP 91.155.x.x
    Owner since: 1 year
    Price: 250 euros
    User profile: Amateur

    Cons: Optically poor before f/2.8 even on DX. Slow(ish) AF.

    Pros: Optically excellent on DX from f/2.8

    Summary: I really love this lens on DX. On FX, the lens is just poor to average and I would pass.

  6. aras
    aras 17 November 2011, 04:15
    Build quality
    Optical quality
    Value for money

    Overall

    IP 85.151.x.x
    Owner since: 6 months
    Price: 300 euro
    User profile: Amateur

    Cons: for photography very soft wide open

    Pros: good for filming,

    Summary: i found it not usable wide open, have to stop it down to f4. But a good lens for filming specially on 5d thou vignetting might be problematic on fullframe. On crop it is is not very wide but no vignetting

  7. Sonylover1
    Sonylover1 9 October 2011, 18:52
    Build quality
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    Value for money

    Overall

    IP 85.225.x.x
    Owner since: 1 month
    Price: 300 $
    User profile: Semipro

    Cons: CA , seems a bit soft (contrast) when shooting daylight - good at low light.

    Pros: Extremely close focus, very good at 1.8 . Sharp from 2.5. Filming in bad light is a joy...

    Summary: Heard a lot of mixed opinions, most negative. Test on "photozone" and "the digital picture" Have the Canon 10-22 and at 4,5 its better for sure but mine Sigma isnt so far away at 1.8.

  8. Helthuis
    Helthuis 4 October 2011, 21:00
    Build quality
    Optical quality
    Value for money

    Overall

    IP 82.75.x.x
    Owner since: 3 years
    Price: 600euro
    User profile: Semipro

    Cons: Needs 82mm filter

    Pros: Very sharp wide open.,reeds the top at F 5.6 ,fastes 20mm on the market.good build quality.

    Summary: Usefull wide open.,very fast for a 20mm whit F1.8 resaneble priced.not too heavy.

  9. uncleskull
    uncleskull 17 September 2011, 13:30
    Build quality
    Optical quality
    Value for money

    Overall

    IP 99.19.x.x
    Owner since: 2 years
    Price:
    User profile: Amateur

    Cons: VERY soft.

    Pros: Good build quality.

    Summary: After 3 different lenses, I gave up. Horrible image quality. Not enough fine tuning adjustment on my D300 to tame this puppy. Not only cannot recommend this lens, I discourage others from buying it.

  10. Marcelo Versiani
    Marcelo Versiani 15 January 2010, 19:53
    Build quality
    Optical quality
    Value for money

    Overall

    IP 200.214.x.x
    Owner since: 4 years
    Price:
    User profile: Professional

    Cons: Soft. Awkward manual/autofocus mechanism. Hunts.

    Pros: Brightest WA. Focus extremely close. Sharp from 2.8.

    Summary: A nice lens for the price, very useful.

  11. Asd
    Asd 8 December 2009, 23:56
    Build quality
    Optical quality
    Value for money

    Overall

    IP 212.80.x.x
    Owner since: 6 months
    Price: 520 $
    User profile: Amateur

    Cons: Flare prone, huge dimensions and weight, slow AF, field curvature, EX finish is easy to harm , I heard about bad copies ( check out photozone.de ), falloff on fullframe

    Pros: Sharp even wide open, floating system= good results for infinity and also close shots,only f/1,8 wide lens, fullframe ready, a little bit of distortion, you will get nice bag, MFD

    Summary: I was suprised, how sharp this lens can be. It can focus really close. These close-shots with f/1,8 make incredible results. True potential of this lens can be used only with fullframe camera.

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