I just bought 2nd hand Tokina lens, 100-300 f/4. tried it out at first seemed fine. then brought it home, found out that when it hunts for focus, it'll rotate to the end but cannot seem to detect the end and keeps trying, resulting in loud "crack crack" of the gears slipping. if I"m not wrong, no matter how old the lens, should be able to detect the end and reverse direction to hunt in the other way for focal point rite?
Anyone knows if I"ve the right to demand a refund? (It's personal transaction, not from 2nd hand shop)
and anyone knows the tokina service centre in singapore address?