Hello Wang, I am new to the post, and a frequent buyer of Hassy Zeiss lenses. I do = not buy C lenses T or no T for the following reason. In Wildi's The = Hasselblad Manual (6th ed.) on pg. 73 he says "The C lenses were = discontinued in 1981. Although such lenses can still be cleaned and = lubricated, many spare parts are no longer available, and more extensive = service is therefore no longer possible." If I plan to use the lens a = lot I spring for the CF (which are all T). I might buy a 40mm CT if = it's a real steal, but I agree with your other answer; multicoating T or = otherwise is a genuine innovation which makes a REAL difference for the = better (check what Ansel Adams says about it in his Basic Photo Series). = Anybody who tells you non T lenses are "better" is just trying to sell = you what he/she has, rather than what they wish they had. Be well dbrender