The Sigma dp0 Quattro is in stock at B&H Photo.
- Peak sharpness is reached wide open (f/4) for most of the frame, with only the extreme corners scoring very slightly below the f/5.6 aperture. Not enough for the eye to perceive it.
- At f/4, center resolution is only two hundredths short of the theoretical maximum for the Quattro sensor.
- Resolution figures in the corners are lower than in central areas, but perceived sharpness remains very high wherever one looks.
- For the best results, don’t stop down past f/8.