Image sharpness: The EDF delivers the most convincing performance.From the center to about 80% (radial) to the edge, stars look point-like, and close to the edge the distortions are low to moderate.

• 图像清晰度：EDF有最有说服力的表现，从中心到离边缘80%25（半径）处，看星星还是点状，接近边缘处的变形低至中等。