The Carl Zeiss Biogon T* 2.8/25 ZM is a wide-angle fast lens with the T*-coating and 82 degrees of viewing angle, ideally fit for shooting landscapes, cityscapes and architecture thanks to its almost completely corrected distortion.
According to Camera Lens News (no. 24, Feb., 2006), the Carl Zeiss Biogon T* 25 mm f/2.8 ZM set a new record of resolution - 400 lpmm at the center of the picture at f/4. This value corresponds to the maximum theoretically possible resolution or rated diffraction limit at this aperture setting.
The generated image has a plastic bokeh; the texture of circles of confusion is ideally even. The lens is sharp at the center and on the edges when the aperture is wide open; it has an explicit a 2/3 stop vignetting; the corners are slightly soft. From f/3.5 onwards it produces ideally even field; no vignetting is visible. The CAs are absent. As well as the majority of the ZM-lenses, the lens doesn't produce flare.
Its immediate competitor is the Leica SUMMILUX-M 24mm f/1.4 ASPH, whose market price is about 6,000$.
It is equipped with the focusing ring with 1/3 stop interval for exact exposure. The delivery kit includes the lens only. The viewfinder and the hood (25/28mm or 21/25mm) are sold separately. However, there is no special need of the hood.
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Posted by: Leopold Date of publication: 24.12.2011