Carl Zeiss Biogon T* 2,8/28 ZM Pro Reviews

The Zeiss Biogon T* 28mm f/2.8 may be a star on Leica M film cameras but it struggles somewhat with the Sony sensor in the NEX-5. The image quality is pretty much breathtaking in the image center but the border performance is actually much less impressive and in fact quite soft at large aperture settings. The barrel distortion is barely visible. The vignetting characteristic is less than impressive at f/2.8 and still comparatively high beyond which is quite surprising for a full format lenses used on an APS-C camera. The build quality of the Zeiss lens is superb thanks to an all-metal body and super-smooth controls. However, regarding its optical characteristic on the Sony NEX-5 it is not an obvious choice - especially regarding its rather high price tag.