Sigma 35mm F1.4 DG HSM "Art"

Vignetting

Vignetting (darkening of the corners of the frame) should not be a big issue with this lens, as the APS-C frame only sees the "sweet spot" of the image circle.  Our tests confirmed this; at F2.8 and higher, there is no visible vignetting on APS-C.  There is moderate vignetting wide-open and slight vignetting at F2.  All this can easily be corrected using desktop software (in-camera corrections are not available for Sigma lenses when mounted on a Pentax).

F1.4 F5.6
F2 F8
F2.8 F11
F4 F16

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