A Depth of Field preview causes the lens iris to close to the aperture setting that will be used to take the picture as indicated by the camera’s data panel. This enables "seeing" the sharpness of the recorded image (slide or print).
The following Dynax cameras offer Depth of Field Preview:
Dynax 9000, 9xi, 600si, 700si, 800si, Dynax 9, Dynax 7, Dynax 5, Dynax 5D and 7D.
The following Manual focus cameras offer Depth of Field Preview
SRT 100, SRT 100x, SRT 200, SRT 201, SRT 101, XK, XK Motor, XM, XM Motor, X1, SRT 102, SRT 303, XE 7, XE 1, XE, XE 5, XD 7, XD 5, XG 9, XG-M, X-700, X-500, X-570