Sigma 20mm F1.8 EX Aspherical DG DF RF A-mount lens review by QuietOC

reviewer#44207 date: Jan-12-2019
sharpness: 3.5
color: 4
build: 3
distortion: 3
flare control: 3
overall: 3.3
tested on:
  • film camera:Film camera
  • APS-C: 6MP6 MP; 10MP10 MP; 12MP12 MP; 14MP14 MP; 16MP16 MP; 20MP20 MP; 24MP24 MP
  • full frame: 12MP12 MP24MP24 MP36MP36 MP42MP42 MP
ownership:I own this lens
compared to:Samyang 12 F2
Sony E 16 F2.8
Tokina 17 F3.5
Sigma 19 F2.8 DN Art
Sony E 20 F2.8
Minolta AF 20 F2.8 & RS
Sigma 24 F1.8 EX DG
Sony Distagon 24 F2 SSM
Minolta AF 24 F2.8
Sigma 24 F2.8 SW II
Rokinon AF FE 24 F2.8
Tokina AF 20-35 F3.5-4.5 I & II
price paid:160 USD (used)
positive:Center sharpness wide-open
Consistent color/minimum shading
negative:Size and weight
Purple fringing
Axial CA
Concave focus curvature
Edges never sharpen
comment:A nice looking copy in original packaging with original hood, missing original lens caps. "LENS MADE IN JAPAN"

This is a large lens. It looks very similar to the 24 and 28 mm F1.8 EX DG lenses. This copy is better aligned than either of the 28 mm F1.8 EX DG lenses I've tried or any of the other full frame ultra wide angle lenses. It is decently sharp wide-open in the center.

The Minolta 20 F2.8 isn't as sharp in the center but has a much flatter focus plane which is probably better for many uses of an ultra wide prime.

This works quite well for small indoor rooms.

rating summary

lens image
  • total reviews: 34
  • sharpness: 4.35
  • color: 4.50
  • build: 4.56
  • distortion: 4.26
  • flare control: 3.94
  • overall: 4.32
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