Hi, all. I`m wondering about the diferences between this designs. I know wide angle lenses use to favour the assimetrical Retrofocus design to save the mirrors, and Gauss designs use to be common from standard lenses to moderately long ones, but... what about the differences of both designs in "standard" focal lenghts? Mamiya offer both designs in their "standard" range of lenses (90, 110, 127, in different versions). As far as I know, the main differences could be: Advantages: Retrofocus: Even illumination across the frame Gauss: Higher center sharpness Better aberration correction Higher lens speed Better close to infinity distance performance without floating elements Disadvantages: Retrofocus: More pronounced field curvature Higher distortion Poor performance along the distance range Gauss: Vignetting --- Am I missing something? If not, the Gauss looks to be a clear winner. I wonder about the usefulness of the retrofocus design for lenses that barely are moderate wide angles, but has been classics in the Mamiya lineup and continuously updated. I also wonder if Hasselblad has similar options (like that 90 Retrofocus and 110 Gauss Mamiyas). Why they still list retrofocus standard lenses? Is the focal lenght the only attractive? What do you think?