6 group / 12 element, MFD = 1.1m, 620g, $400 @2004
Yes, this is another rare zoom by CZJ. It is IF-style zoom, and has a modest
F4 constant aperture. The optical design is surprizingly almost same as Leica's
Vario-Elmar-R 80-200/4, and Contax's Vario sonnar 80-200/4 with one more
element to correct softness at the long end at the wide open. I do not know
why they are so similar in optical design, but it is not a bad lens at all, actually
80mm end is quite sharp at even F4. There exists M42 version of this lens too.