Sigma A 20 mm f/1.4 DG HSM
11. Summary
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Pros:
- unique parameters,
- solid and stylish casing,
- brilliant image quality in the frame centre,
- excellent resolution on the edge of the APS-C/DX,
- acceptable image quality on the edge of full frame,
- slight lateral chromatic aberration,
- sensible correction of spherical aberration,
- lack of serious distortion problems,
- slight vignetting on the APS-C/DX sensor,
- silent and quick autofocus,
- excellent parameters/price and performance/price index.
Cons:
- noticeable coma,
- very high vignetting on full frame,
- work against bright light could have been better.
I admit that the tests of fixed focal length Sigma Art series lenses are becoming a bit boring. Every time you get a mechanically solid instrument with outstanding optical properties which, additionally, is sold for a sensible amount of money. When it comes to the model, tested here, Sigma went even one step further, offering original parameters which are hard to find in the line-up of other optical producers. I think there is nothing left to say…
