Sony Carl Zeiss Vario Sonnar 24-70 mm f/2.8 T* SSM review - Vignetting

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Sony Carl Zeiss Vario Sonnar 24-70 mm f/2.8 T* SSM

14 September 2010

Arkadiusz Olech

8. Vignetting

As long as Sony doesn’t launch its full frame reflex camera on the market, the Zeiss users won’t know what the vignetting means. In short we can write that the biggest light fall-off in the frame corners amounts to just 15% and it is a value close to imperceptible in real life photos. It would be enough for a commentary on vignetting but nevertheless as a matter of form we will give you here precise values determined by our measurements.

Sony Carl Zeiss Vario Sonnar 24-70 mm f/2.8 T* SSM - Vignetting

At 24 mm focal length and wide open the brightness loss in the frame corners is 14% (-0.43 EV). On stopping down to f/4.0 we see the problem being eliminated completely, reducing it to the level of 10%.

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In the middle of the focal lengths range the situation is the best. Even by f/2.8 the vignetting reaches just 11% (-0.33 EV) and it decreases to 8% by f/4.0.

At 70 mm the level of this aberration increases slightly once again and, at the maximum relative aperture, it amounts to the aforementioned value of 15% (-0.46 EV); by f/4.0 it decreases to 5%.