Enrico Pocopagni , Sep 05, 2000; 02:37 a.m.
Hi, Kah I have a 180 f/4.5 W-N. It is a Tessar lens (four elements in three groups optical scheme). It is a very sharp lens with more than satisfyng contrast. The two previous versions of the lens are substantially the same (W stands for Wider f-stops gaps on the aperture ring, making easier to set fractional f-stops). The optical scheme, as stated by Mamiya RZ67 owner manual is made of five lenses in three groups. Geometrical characteristics (angle of coverage, minimum focusing distance) are the same, but I never tried this lens. Considering the release dates, I hope the last (N stands for New) is the best. Regards. Enrico
