Nikon D3000 Reference Manual

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49
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❚❚The Electronic Rangefinder
If the lens has a maximum aperture of f/5.6 or faster, the 
viewfinder focus indicator can be used to confirm whether the 
subject in the selected focus point is in focus (the focus point 
can be selected from any of the 11 focus points). After 
positioning the subject in the selected focus point, press the 
shutter-release button halfway and rotate the lens focus ring 
until the in-focus indicator (
I) is displayed. Note that with the 
subjects listed on page 42, the in-focus indicator may 
sometimes be displayed when the subject is not in focus; 
confirm focus in the viewfinder before shooting.
A
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 46.5 mm (1.83 in.).
A
The Exposure Indicator
If desired, the exposure indicator can be used to determine whether the focus point for 
manual focus is in front of or behind the subject (
0 132).
Focal plane mark
  46.5 mm