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w Nippon Kogaku 日本光学 1965
the lens + L39->M42 + M42->M42(15.5-26mm helicoid) + M42->E(CMHT)
CMHT > http://www.pbase.com/kkawakami/image/154389559
L39->M42(7844) in the above can be substituted by simple step-down
42->39mm ring, however this ring is much thicker though.