* High-precision perfect transmission, aluminum-magnesium alloy ring body, fine copper bayonet does not wear the lens, the workmanship is very exquisite, closely and smoothly combined with the bayonet, maintain focus, play the macro function of the lens, and can be infinitely close to the center of gravity . * High-precision perfect transfer, aluminum-magnesium alloy ring body, fine copper bayonet will not wear the lens, the workmanship is very exquisite, tightly and smoothly combined with the bayonet, receive focus, play the lens macro function, and can be infinitely close focal. Adapting a full frame lens to an APS frame camera provides excellent edge-to-edge sharpness. The smaller field of view helps minimize the effects of lens distortion and aberration by using the "sweet spot" or cen.
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