http://www.mir.com.my/rb/photogr ... ultrawides/20mm.htm

尤其是这个：
http://www.mir.com.my/rb/photogr ... ltrawides/20mma.htm

Although this lens has not been equipped with an CRC system for optimizing its close focusing performance, but this 20mm lens can also a superb lens for closeups. When used it in conjunction with bellows and BR-2/3 reverse adpter ring, it is possible to reach an astonishing magnification up to 12X with this tiny sized Nikkor ultrawide.

不过他说的是要带皮腔才行，，，

皮腔+倒装接环，，，，

完全可以啊。 那苍蝇好大啊。