The shortest focal length is the place where the chromatic aberration will be the most bothersome. There, at the maximum aperture, it reaches high values; on stopping down the aberration decreases but very slowly. In the middle of the focal lengths range the aberration decreases to a medium level and at 22 mm its level is low.
Here again the ZD 11-22 mm is defeated - the ZD 12-60 mm had the results in the 12-23 mm range at the level of 0.05% or lower.
