I have just been given two Carl Zeiss lenses. Apart from being very dusty, they look O.K. Both are called Carl Zeiss Jena, one is f.2.8/ 28mm the other is f2.8/135mm. The lenses also have 'MC' on them - don't know what that means.

Does anyone know anything about these lenses?. The only 35mm camera I have is a Nikon FM2 - sorry if this is a basic question, but is there any way I could or should use them with this camera? They're obviously not quite the same, but is it possible to get an adaptor ring? (doesn't matter if the metering doesn't work)...