I am planning to pick up a used Hasselblad. For the lenses I know there are the silver C lenses, some of which were not labelled but may have had the lens coating, then there was the black lenses with the C T* coating (was it ..) then the CFE lenses. I don't mind if they are not repairable by Hasselblad. I shoot colour slides and that is my final output. Mainbly cityscapes and landscapes, some portraiture but few. Basically what are the differences between these lenses? Many thanks.