Zeiss Biogon T* 28mm f/2.8 ZM on Sony NEX - Review / Lab Test Report
Lens Reviews -
Sony Alpha/NEX (APS-C)
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Review by Klaus Schroiff, published August 2011
Regarding the current lack of native E-mount lenses many Sony NEX users are looking beyond the Sony lineup. The Leica M world offers a wealth of small primes lenses which can easily be adapted e.g. via a Leica M to Sony NEX adapter (we recommend Metabones adapters). Original Leica M lenses tend to be prohibitive from a pricing perspective but the Zeiss ZM and Voigtlander VM offerings are actually not totally out-of-reach. This time we will have a look at the Zeiss Biogon T* 28mm f/2.8 ZM which is available either in silver or black.
Such adapted lenses can only be used with manual focusing and "working aperture" - there's no data coupling whatsoever here. However, due to the lack of dedicated prime lenses in Sony E-mount it's surely one of the more interesting fall-back solutions for the NEX-system. In terms of field-of-view and depth-of-field it is equivalent to a 42mm f/4 lens on a full format camera. While not terribly exciting regarding shallow depth-of-field photography it remains a viable option for street photography for instance. At around 850EUR the Zeiss lens is far from being cheap though but let's have a look whether it is worth it.
Typical for most Zeiss lenses, it's a full-metal construction build to the highest standards - except for the lens cap which is rather crappy.The focus ring operates as smooth as silk (dampened). The aperture is set in 1/3EV steps at the front of the lens. Any change of the aperture is applied immediately so you can check the effect on the depth-of-field on your screen - without the darkening like on DSLRs when adapting non-native focus lenses). The lens extends marginally when focusing towards closer focus distances. The front element does not rotate.
Manual focusing may sound like a major annoyance but it is not that bad actually. Recently Sony added "peaking" focus support to Sony NEX cameras which is already helping a lot here. Other than that you can easily switch to a magnified focus view so accurate manual focusing is really simple ... unless you try to track a moving object of course. We recommend this camera-lens combination for static scenes only.
|Equiv. focal length||42 mm (full format equivalent)|
|Equiv. aperture||f/4.2 (full format equivalent, in terms of depth-of-field)|
|Optical construction||8 elements in 6 groups|
|Number of aperture blades||10|
|min. focus distance||0.5 m (max. magnification ratio 1:16)|
|Dimensions||53 x 62 mm|
|Filter size||46 mm (non-rotating)|
|Hood||optional, barrel shaped|