Miket, depthoffield has been discussed on this forum before so I you want you can look back for the previous discussions. Briefly, the CCD sensor is smaller than 35 mm frame size. This means that for the 7 series cameras a shorter focal length lens than would be used for a 35 mm camera will give the same field of coverage. Since 35 mm cameras are pretty much considered a standard Minolta has done us a favor by stating the focal length for the camera in 35 mm camera equivelents. The true focal length of the lens is 7.2  50.8 mm (page 160 of the manual), which is equivalent to a 28  200 mm 35 mm camera lens.
The depthoffield for a lens increases as the focal length decreases  BUT ONLY FOR A FIXED IMAGE SIZE. Since the image of the 7 is smaller than that of a 35 mm camera it turns out that the depth of field is the same as it would be for a 35 mm camera with the equivalent focal lenth lens. What this means is that for all practical purposes just pretend that you are shooting a 35 mm camera and you will do fine on depthoffield.
