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next PZ lens test report: Sigma 24mm f/1.4 HSM DG "Art" ... on APS-C
#3
The 24/1.4A suffers a much worse field curvature situation than the 24L II.  Or rather, the astigmatism of the 24L II is much better tamed. 

 

http://www.the-digital-picture.com/Revie...p=5&CT=AVG

 

24L II has 3rd and 5th order curvatures balancing each other, 24A has an exquisite sagittal plane and either a badly curved tangential one, or much worse lateral color. 

 

Corner issues in MTF tests are not exclusively to do with field curvatures, there are many field-dependent aberrations that contribute.

  


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next PZ lens test report: Sigma 24mm f/1.4 HSM DG "Art" ... on APS-C - by Scythels - 08-26-2015, 12:51 AM

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