Sigma 20mm F1.8 EX Aspherical DG DF RF A-mount lens review by awaken77

reviewer#2362 date: May-26-2007
sharpness: 4
color: 5
build: 5
distortion: 4
flare control: 4
overall: 4.4
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 MP; 24MP24 MP; 36MP36 MP; 42MP42 MP; 61MP61 MP
ownership:I own this lens
compared to:Tamron 17-50mm/2.8
price paid:380 USD
positive:Sharp from F/2.8
Low distorsions
Nice finish and build quality
Wide manual focusing ring, not rotate in AF mode
Close focus ability
Price (cheaper than used Minolta 20mm/2.8 at this time)
negative:Sharpness drops towards the corners significantly at wide open
Huge filter thread 82mm , requires expensive filters
Confusing dual AF-MF system
comment:I got this lens primarily for 2 purposes:
1) landscape photography with accented foreground. Becouse of close focus ability, this lens allows to capture detailed foreground objects (like flowers, etc.), and blur the background nicely.
2) candid / street photography in the low light and in tight places. This lens allowed me to shoot jazz concert in a poorly lightened scene at wide open apertures (like F/2 - F/4).
Although this lens has poor corners below F/5.6, this is not an issue in this case. Knowing this feature allows to compose frame properly.
On the Sony Alpha DSLR it is an equivalent of 30mm.
I also used that lens on Minolta Dynax 7 film body, with positive films like Sensia, Velvia and got a good results with nice colors.

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 - Home of the alpha system photographer
In memory of Cameron Hill - brettania