SSM is a supersonic Sony motor (very fast) as opposed to SAM, Smooth Autofocus Motor which is slower and noisier. SAL is a Sony Alpha Lens which can be either.
Thanks for the input. If you go to dyxum.com and then click on Lenses, you can get specifications and reviews of every A mount lens ever manufactured.
Bob
Ron: That really is a mouthful. Catch you at the Inlet again.
Bob