출처(클릭)

Advantages

• robust metal housing and sealed,실링된 튼튼한 경통
• very good image quality in the center of the frame,아주 우수한 중앙부 화질
• good image quality at the edge of the frame and that the maximum relative aperture,개방에서도 우수한 주변부 화질
• moderate longitudinal chromatic aberration,축상색수차는 무난함
• virtually zero distortion,사실상 무왜곡
• vignetting significantly smaller than those of competitors,경쟁 렌즈보다 주변부 광량저하 적음
• coma significantly lower than competitors,경쟁 렌즈보다 코마 수차가 현저히 적음
• quiet, rapid and accurate autofocus.정숙하고 신속하며 정확한 AF

Disadvantages:

• Lateral chromatic aberration corrected worse than competitors,경쟁 렌즈보다 색수차가 많음
• noticeable spherical aberration,구면 수차가 꽤 보임
• too much astigmatism,비점 수차가 심함
• problems at work against bright light.역광 성능 별로임