Nikon D40x D40X User's Manual - Page 40
Manual Focus, When using a lens that offers A-M selection, select M when focusing manually. - camera lenses
UPC - 018208094219
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Manual Focus Controls used Use this option when the camera is unable to focus correctly using autofocus. To focus manually, select manual focus mode and adjust the lens focusing ring until the image displayed on the clear matte field in the viewfinder is in focus. Photographs can be taken at any time, even when the image is not in focus. When using a lens that offers A-M selection, select M when focusing manually. With lenses that support M/A (autofocus with manual priority), focus can be adjusted manually with the lens set to M or M/A. See the documentation provided with your lens for details. The Electronic Range Finder If the lens has a maximum aperture of f/5.6 or faster, the viewfinder focus indicator can be used to confirm whether the portion of the subject in the selected focus area is in focus. After positioning the subject in the active focus area, press the shutter-release button halfway and rotate the lens focusing ring until the in-focus indicator (z) is displayed. Note that if the subject is one for which autofocus does not perform well ( 27), the in-focus indicator may be displayed when the subject is not in focus. Confirm that the image in the viewfinder is in focus before shooting. Focal Plane Position To determine the distance between your subject and the camera, measure from the focal plane mark on the camera body. The distance between the lens mounting flange and the focal plane is 46.5mm (1.83 in.). 28 Reference: More on Photography (All Modes)/Focus