You need the Mamiya DF or DF+.... or..... Phase One DF or DF+ to have focal plane shutter support.
AFD III does not support the leaf leaf shutter.
The DF has been updated with the DF+ hopefully improving on the issues the DF had. Better to wait for feedback on the DF+.
Originally Mamiya introduced the leaf shutter on the AFD III running at upto 1/800 sec.
Cologne, Germany – September 17, 2008 – In response to requests from Mamiya owners, a new leaf shutter lens for the 645 AFD III will be introduced at Photokina 2008.
The Mamiya Sekor AF 80mm F2.8 D L/S will be the first leaf shutter lens in Mamiya’s AF L/S Digital lens lineup. The leaf shutter, which has been developed and manufactured in-house by Mamiya, is capable of shutter speeds from 1/800 second to 16 seconds, and has flash synchronization at all speeds. This allows more creative control and flexibility when shooting on location where daylight flash synchronization is often required. The option of higher sync speeds can also be beneficial for flash photography in studios.
“The Mamiya Sekor AF 80mm F/2.8 D L/S,” says Jeff Karp, Mamiya Product Marketing Manager, “is unlike any other lens system available today. It has the advantage of high flash sync speeds -- up to 1/800 second when used as a leaf shutter lens -- and a top shutter speed of 1/4,000 second when used with the Mamiya 645AFD III’s built-in focal-plane shutter.”
The optics have been designed to direct light onto digital sensors at an angle that will produce outstanding sharpness, contrast and color accuracy - vital requirements for today’s high-end digital backs.
The Mamiya Sekor AF 80mm F/2.8 D L/S contains a 16bit CPU that allows easy firmware upgrading, fine lens characteristic correction and fast, reliable communication between the lens, camera body and digital back.
The lens has an angle of view of 47 degrees in the 6 x 4.5 format, the equivalent of a 50mm lens in the 35mm format. Switching between manual and auto focusing is achieved by simply moving the focusing ring back and forward. Like all Mamiya Digital lenses, the 80mm f/2.8 D L/S is designed to work with film backs, not only digital backs.
Final pricing and availability will announced later this year.
It seems LS support upto 1/800th was possible with the AFD III, but was not releases to the users.