Soligor C/D 28-80 f3.5-4.5
This is a nice lens. My copy was most likely made by Sun Optical. It's built very well. Focusing and zooming are well dampened. My copy had no zoom creep. Optically, it is every bit as good as my Tamron 17-50 f2.8. That's right folks, it's sharp. The C/D line was Soligor's best and this lens shows why. It gives a 1:4 macro ratio at 28mm.