for those of you who have a Kenko KNT-20 - The B & H website says the KNT-20 does not have outside threads, the Lensmate website says it does. It has got to be the same - both list as KNT-20. Has anyone gotten one of these from either site? I want one with the outside threads so I can use filters. Or, if you have other suggestions for where to purchase, I would appreciate it.