Nikon D5100 Reference Manual - Page 177

a3: Rangefinder G button ➜ A Custom Settings menu Choose On to use the exposure indicator to determine whether the camera is correctly focused in manual focus mode (0 65; note that this function is not available in shooting mode M, when the exposure indicator instead shows whether the subject is correctly exposed). Indicator Description Camera in focus. Focus point is slightly in front of subject. Focus point is well in front of subject. Indicator Description Focus point is slightly behind subject. Focus point is well behind subject. Camera can not determine correct focus. A Using the Rangefinder The rangefinder requires a lens with a maximum aperture of f/5.6 or faster and is not available in live view. The desired results may not be achieved in situations in which the camera would be unable to focus using autofocus (0 40). b: Exposure b1: EV Steps for Exposure Cntrl. G button ➜ A Custom Settings menu Select the increments used when making adjustments to shutter speed, aperture, exposure and flash compensation, and bracketing. c: Timers/AE Lock c1: Shutter-Release Button AE-L L G button ➜ A Custom Settings menu At the default setting of Off, exposure only locks when the AE-L/ AF-L button is pressed. If On is selected, exposure will also lock when the shutter-release button is pressed halfway. 159