Quote Originally Posted by Satinsnow
There are certain lenses that are designed for the Pro SD only, I would check with Mamiya on this one, all printed information I have indicates the KL are for the Pro SD only, it has been several years since I sold mine and never owned the adapter, so again I would suggest asking Mamiya

The KL Lenses work with the non-s and non-SD RB. I have a 127 KL lens that I use on my RB67 body.