Hi, I have the chance to get 3 lenses from my grandpa who traded his film-SLR for a normal digicam. Those would be: Zeiss Sonar 135mm f/3.5 (or 4.0, getting different results on the web for this one) Pentacon auto 28mm f/2.8 Pentacon auto 50mm f/1.8 The last one sounds especially good for portrait reasons, for the others I don't know. The 28mm would be covered by my 18-55mm AF Nikkor, but it has a bigger aperture (the Nikkor does f4.0-f4.2 in that range, but how much does that matter really, I have no clue). For the telephoto lens I was planning to get some 55-200mm some time in the future, but I guess that the one I can afford won't reach that aperture either. So has anyone experience with those lenses and would tell me if they are a good thing to get, maybe a note about quality and the like. I plan to use them on a Nikon D50, so I guess I need to get an adapter.