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Sigma 20 mm f/1.8 EX DG Aspherical RF
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 (7 owners reviews).
| Build quality | 4.00 |   |
|---|---|---|
| Optical quality | 3.14 | |
| Value for money | 3.71 |  |
| Overall | 3.62 | |
| Build quality |  |
|---|---|
| Optical quality | |
| Value for money | |
| Overall | |
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.
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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
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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.
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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.
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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.
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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.
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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.
