What's wrong with this Sigma 56mm?

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d_chiesa Regular Member • Posts: 405
What's wrong with this Sigma 56mm?

Hi,
i just received a sigma 56mm 1.4; i had high hopes for it and did a quick test against my Oly 45mm 1.8
Upon opening the shots in C1, first thing i noticed is the lack of correction for the Sigma, showing some pinchcushion distrotion; i just fixed it manually, although it was already a nuisance.
Then i immediately noticed some strange coloring on the Sigma samples, even without zooming in; i have no idea if it's some reflection from the camera's sensor or what.
These are two samples, small 100% crops, both at f/2.8, same WB and no adjustments:

Oly:

Sigma:

What the hell is going on here? I checked the newspaper and there is no trace of that stuff.
I can see how much sharper the Sigma is, and it's nice to use, brighter and so on: but this is so off...
Thnak you for all the suggestions,
D.

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