Hello, I have the chance to buy a Soligor C/D 70-210 / f:4.5 zoom lens in good condition, mechanically and optically too. But, I don't know its performace. I would like to ask you, hoping that some of you have some experience with this lens, about how sharp is at f:4.5 (wide open) at all focal lenghts, how present CA is and in general the same issues at f:8 and more (f:11,f:22...). May be some links or samples would help me a lot in taking a decision (to buy or not to buy). The price would be around 55 USD (shipping included). Thank you a lot.