33Tutorial—Basic PhotographyStep 5—Check ExposureIn exposure mode P (programmed auto), the cam-era automatically sets shutter speed and aperturewhen the shutter-release button is pressed half-way. Before shooting, check the shutter-speedand aperture indica tors in the viewfinder. If thephoto would be under- or over-exposed at cur-rent settings, one of the following indicators willappear in either the shutter-speed or aperturedisplay.Shutter Speed and Camera ShakeTo prevent blurring caused by camera shake, the shutter speed should be faster thanthe inverse of the focal length of the lens, in seconds (for example, if a lens has a focallength of 50 mm, shutter speed should be faster than 1/60 s). Use of a tripod is recom-mend ed when shooting at slower shutter speeds. To prevent blur, try increasing ISOsensitivity ( 52–53) or using a VR lens. An optional Speedlight ( 108) can be usedto prevent blur at shutter speeds of 1/60 s or slower.Indicator DescriptionPhoto will be overexposed. Use optional Neutral Density (ND) filter.Photo will be underexposed. Raise ISO sensitivity ( 52–53) or use op-tional Speedlight ( 108).5
