Nikon F70 Instruction Manual

Nikon F70 Instruction Manual Manual pdf 37 page image

73SPECIAL FUNCTIONSThis chapter explains advanced photographic techniques andapplications including exposure compensation methods. It alsoshows you how to use the self-timer and how to perform longtime exposure.EXPOSURE COMPENSATIONExposure compensation is a photographic technique thatenables you to vary the final exposure settings from thosemeasured by the camera’s light meter. Nikon’s 3D MatrixMetering employs methods of exposure calculation thatautomatically apply exposure compensation, depending uponscene brightness and contrast, and distance information. As aresult, your subject, whether it is centred in the viewfinder ornot, is given corrected exposure in most lighting situations.We do not recommend using any manually or automaticallyapplied exposure compensation when using Matrix Metering. Ifyou identify an extreme condition under which Matrix may havesome difficulty, such as a severely backlit scene or one withextremes of contrast, we recommend using your camera’sother built-in meters, Centre-Weighted or Spot. Ultimately, onlyyou know what the subject or a part of it requires in terms ofexposure measurement. That’s why the F70/F70D cameraincorporates three meters plus a variety of exposurecompensation systems. The photographer’s creativity is alwaysthe final deciding and controlling factor. To use the variousexposure compensation functions, please refer to the following.• Using auto exposure lock function with AE-L button (pages74 to 75)• To obtain meter reading for a particular subject in Manualexposure mode (pages 76 to 77)• Modifying exposure control by exposure compensationfunction (pages 78 to 79)• All Mode Exposure Bracketing (pages 80 to 81)Results will vary, depending on conditions, so you will want toexperiment with each method.About reflectanceWhen using the Centre-Weighted or Spot Meter, alwayskeep in mind that the exposure indicated will assume thatthe subject’s reflectance is equivalent to 18%. If thesubject varies from this reflectance, you must make anadjustment to exposure. Generally speaking, a whitesubject will have about a 90% reflectance, and anadjustment of 2.5 f/stops (further open) will bring theexposure back to the equivalent of an 18% reading. Asanother rule of thumb, when shooting a landscape, thelight meter reading from green grass is roughly equivalentto 18% reflectance.3 PM Page 72