The lens is sharp straight from its maximum aperture of f/2.0, with only a mildly apparent fall-off in acuity toward the edge of the frame. The lens also excels at low-light photography given its fast maximum aperture of f/2.0 and exceptional coma control. In addition, having a wide-angle field-of view allows for longer exposures to be taken of stars without the effect of star trails affecting the resultant image.
