Mamiya 645 AF - Manual (Page 19)

Using the Focus Lock Function
If the object on which you want to focus is not in the focus frame, the camera focuses
on the background at the middle. In such cases use the focus lock mechanism to lock
the focus before taking the picture.
1. Set the focus mode selector lever
to "S".
2. Change the composition.
With the shutter release button half-pressed,
move the camera to achieve the desired
composition, then release the shutter.
AF Supplemental Infrared Light
When the subject is dark or the contrast is low
and the camera is having trouble focusing auto-
matically, a red lamp may light on the front of
the camera when the shutter release button is
half-pressed. This is a supplemental light that
assists the camera's auto focus function.
*The AF supplemental infrared light is only emitted when the focus mode is set
to "S" (single focus mode).
*The AF supplemental infrared light's reach is limited. It does not reach distant
subjects.
Range: 9 meters (when using an 80mm f/2.8 lens)
*When using a bellows lens hood (sold separately) with a diameter larger than
that of the lens, focus before mounting the hood.
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