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Paul Yi wrote:
Is it true that Contax N 50/1.4 is basically same optical design as C/Y 50/1.4?
I think, "basically" is correct. Consensus is that little was done to the optical design, but don't really know if there was some small or subtle tweaks done or not (glass formulations, etc.). There are, however, significant improvements in barrel design and coatings that will improve overall performance (flare, internal reflections, ghosting, etc.) compared to the c/y (or RTS) version of the lens. The aperture mechanism and shape is also a little different and that may contribute to the perception of improved bokeh that cyberstudio mentions.