One Kindai Rollei QBM/EOS adapter for sale, near mint condition. The quality of Kindai/Rayqual adapters is on a par with Novoflex, they are made in Japan. This adapter has been out of production for several years I'm told due to the difficulty in production. It is approx. .021" thick +/- .0005" which is a necessity to achieve infinity focus of many of the excellent Rollei/Zeiss QBM mount lenses, in particular the 16mm F-Distagon. $115 shipped first class Conus.
Might consider trades, could use a 21mm viewfinder.