I have been using the Nikon system for about 18 years before I discover the carl zeiss lens charteristics.Ever since then,there is no turning back for me. This topics have been actively discussed at the other contax mailing list.For the benefit of those who have not read about it,read on. INCOMPARABLE DELINEATION : Carl zeiss T* lenses backed up by the "zeiss" give peerless tone gradation,deepness of shadow ,high image definition and color rendition in an excellent balance to produce the atmosphere and sense of existence of the subject. COLOR RENDITION : T*lenses give the color renditions as faithful as the colors of the subject as they are or as being viewed by the eyes of the photographer.The color renditions is maintained even if the lenses are interchanged. GRADATION : T*lenses fully utilized the intensity of the lights to express faithfully and richly the gradations of the lights. BRIGHTNESS AND DARKNESS : T*lenses faithfully reproduce the brightness and darkness of the subject in order to express the charm of the light patterns. BACKLIGHT : T*lenses with the original carl zeiss T* multi layer anti-reflection coating minimise the effects of the backlight that shows the ultimate lens performance. OUT OF FOCUS IMAGE : T*lenses give the most attractive out-of -focus images .