See also the review of the Sigma dp2 Quattro.
The Sigma dp0 Quattro extends the focal length range of the Sigma dp Quattro line. Its 14mm f/4 lens is equivalent to a 21mm f/5.6 on a full frame camera.
Includes entire frame images of various sizes up to full resolution at f/4 through f/10 to assess the affects of diffraction and depth of field. Also shown are the Sigma Photo Pro processing settings.