real one must be 600+ HKD ... all germany made optics ... and the ring is so smooth ...
If it is used, it can be lower price ...
but I don't recommend buy a used filter, if it is scratched ... the ebay guy is gone...
don't be scammed ... and cheated in EBAY ...
EBAY is a SELLER MARKET !!!!
B+W filter, brand new ... like a virgin gf ... :)