Nikon F50D Instruction Manual - Page 44

CASES WHERE AUTO FOCUS IS NOT ACCEPTABLE Autofocus operation depends on general lighting, subject contrast and detail, and other technical points. In those rare situations where autofocus is not possible, • blinks inside the viewfinder. • Very dark subject Focus manually (page 45). Or for autofocus, focus on another, brighter subject located at the same distance, recompose with the shutter release button lightly pressed, then shoot. You can also use the built-in flash, or an accessory Nikon Speedlight. • Low-contrast subject Focus manually (page 45). Or for autofocus, focus on another subject at the same distance but with more contrast, recompose with the shutter release button lightly pressed, then shoot. When the focus brackets are positioned on the following subjects/scenes, ignore infocus. indication and focus manually: • Scenes with subjects located at different distances • Bright subjects with a shiny surface, such as silver or aluminum • Strongly backlit subjects • When ·using a linear polarizing filter, or a special filter, e.g., a softfocus filter. (Circular polarizing filters can be used for autofocus.) 44