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Appendix A. Glossary

Term	Definition	Text or Website Reference
aperture	The iris-like opening inside the lens barrel that determines how much light passes through the lens. See also f-stop.	Table 9.3, page 104
Aperture Priority mode (A, Av mode)	The user sets the aperture and the camera sets the shutter speed. The user can also adjust the white balance, ISO, focus methods, EV compensation, and other settings. Recommended for portraits, group, macro, and landscape photography.	Page 103
auto flash	A flash setting in which the camera determines when to use the ...

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