Sony 16-35 f2.8 sharpness test question

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PhotoDiod Regular Member • Posts: 327
Sony 16-35 f2.8 sharpness test question

Can someone with a 16-35 f2.8 GM please comment on its corner sharpness?

I include my test shots below. I took three shots at each tested focal length and then picked the sharpest one of three for analysis. I include one unedited shot of my setup, followed by four photos at different focal lengths where I "moved" the corners closer for easier comparison. (Please disregard brightness variation - I shot under less than perfect overhead light and then added a bit of brightness in PS.)

I am somewhat troubled by the lower left corner, especially at 20mm.

Is this corner performance normal, in particular on a GM lens?

Test setup. 16mm f2.8

@16mm f2.8

@20mm f2.8

@24mm f2.8

@35mm f2.8

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