Nikon D100 Product Manual - Page 44

5Basic Photography Step 5-Check Exposure With the shutter-release button pressed halfway, check the shutter-speed and aperture indicators in the viewfinder. If the photo would be under- or over-exposed at current settings, one of the following indicators will appear in either the shutterspeed or aperture display. Tutorial-Basic Photography Indicator Meaning Photo will be overexposed. Use a Neutral Density (ND) filter. Photo will be underexposed. Use the built-in Speedlight (see opposite) or choose a higher sensitivity (ISO equivalency). Shutter Speed and Camera Shake To prevent blurring caused by camera shake, the shutter speed should be faster than the inverse of the focal length of the lens, in seconds (for example, if a lens has a focal length of 50 mm, shutter speed should be faster than 1/50 s). Use of a tripod is recommended when shooting at slower shutter speeds. To prevent blur, try raising the builtin Speedlight (see following page) or increasing sensitivity ( 48). 3-ISO Auto ( 148) When ON is selected for Custom Setting 3 (ISO Auto), the camera will automatically vary sensitivity from the value selected by the user to help ensure optimum exposure. 9-EV Step ( 151) By default, shutter speed and aperture are shown in increments equivalent to 1/3 EV. Using Custom Setting 9, you can change the increment to 1/2 EV. 32