Canon FD 35-70mm f4
My copy of this lens is in rough shape. The focus helicoid is loose and wobbles. Focusing is a chore and can't be trusted. Having said that, it takes good pics. I won't try to judge its characteristics because I can't trust what I see as typical, so I'll just let you look at the pics.
ISO 800 - f4
ISO 400 - f4 - 35mm - 100% crop
ISO 800 - f4 - 70mm
ISO 400 - f4 - 70mm
ISO 400 - f4 - 70mm - 100% crop