Adaptall 2 for AR Mount Konica Aperture linkage works up to f/16, but not beyond that. If you turn it to the maximum aperture, the aperture will not return, so press the silver protrusion on the side of the mount to release the lock. I am also selling other camera accessories. I will discount 100 yen for combined purchases. If you have any questions, please comment. #Camera Accessories_Korosuke #Tamron Adaptall_Korosuke