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It employs CRC (Close Range Correction, sort of rear optical block floating system),
because of this the lens is hard to disassemble for cleaning/fixing aperture problem.
I got the brand new lens in a half price, for its aperture was dislocated, but fixed it.
321g, MFD < 0.24m, $350 @2002 brand new, but defective, macro goes to 1:2