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在数码单反相机的坚定支持者眼中它们是这个领域的精华:这些全画幅变焦镜头都具有足够大的光圈并且覆盖了大部分焦段。设计生产自动对焦的全画幅镜头,是业内主流的镜头制造商都必须面对的极大挑战。相比更小画幅的APS-C,全画幅镜头需要适应更大的成像圈,对研发者来说意味着全画幅镜头相比APS-C画幅要拥有更大尺寸的镜片组,更优秀的边角分辨率和畸变抑制,更微弱的暗角和更好的自动对焦性能(包括速度和精度)。这对镜
They are the essence of the field in the eyes of the staunch supporters of digital slr cameras: these full-frame zoom lenses have a large enough aperture and cover most of the focal lengths. Designing and producing autofocus full-frame lenses is a huge challenge that must be faced by the industry’s leading lens manufacturers. Compared to the smaller format APS-C, the full-frame lens needs to accommodate a larger imaging circle, which means to developers that the full-frame lens has a larger size lens set than the APS-C frame, and a superior edge Angular resolution and distortion suppression, faint dark corners and better autofocus performance (including speed and accuracy). This pair of mirrors