Use of the TAMRON 'Adaptall Mount; system - YouTube
Tamron Adaptall (Adaptall-2) Mount SLR Lens to Pentax K (PK) Mount SLR Camera Body Pro Mount Adapter – Fotodiox, Inc. USA
Amazon.com : Fotasy Tamron Adaptall II Lens to E-Mount Adapter, Tamron Adaptall-2 E Mount Lens Adapter, Compatible with Sony a7 a7R a7s II III IV a9 a7c Alpha 1 a6600 a6500 a6400