Don't forget there are three 28-105 FA lenses and not all of them are good performers.
FA 28-105/3.2-4.5 AL (IF)
FA 28-105/4-5.6 Power Zoom
FA 28-105/4-5.6 (IF)
The power zoom version is the one I have and it is a great lens although the power zoom feature does not work on DSLR's.