They will also work on autofocus bodies such as the Mamiya 645AF, Mamiya 645DF and Phase One 645DF, but manual-focus lenses will require light metering after the lens has been stopped down, unlike native autofocus lenses.

In order to take advantage of the faster speeds the internal shutter had to be fired at 1/30th of a second or slower.

LED under / over * when used with 80mm f/1.9 lens and 100 ISO film The Mamiya 645 Autofocus (AF) system was launched in 1999 with the 645AF.

It was a departure from the previous manual system, in that the finders and grips were no longer detachable and interchangeable.

Manual-focus lenses could still be used on the autofocus cameras, but not vice versa.