http://www.adorama.com/alc/taginfo/taking <p><span style="font-size: small;">Most lenses are designed to work under normal lighting conditions. In photographic terms, "normal" generally means outdoors. Normal lighting may work in overcast weather, shade of trees or buildings, or in brightly lit rooms with skylights and plenty windows, but the real world isn't always like that. </span></p> http://www.adorama.com/alc/article/8653