G
Guest
>Sounds like the connection between the aperture ring and the aperture blades is assemled wrongly, or was demaged by an external shock. If you can not return the lens to the seller I'd recommend you to clarify the price of repair. I suspect that fixing this misfunction is something like 'disassembling+correct assembling', or may be replacing a single mechanic detail. It should not cost much.
Sergei
Sergei