Test: Einzeltest: Zeiss Biogon T* 28mm f/2.8 ZM
Zitat: 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 border quality improves to very good levels (just) when stopping down though. There´s a bit of a reddish tint in the image corners which suggests a rather "difficult" angle-of-light for the sensor. Lateral CAs are very well controlled. 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 Biogon is a Leica M mount lens which can easily be used via a Leica M to E-mount adapter. Consequently you´ve to live without AF and an automatic aperture. However, thanks to the EVIL design of Sony NEX cameras (magnified focus view, LiveView) this is less of an issue compared to adapter solutions on DSLRs. 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.
