Auto exposure Lock. Metering feature that used to hold the exposure setting when used in the automatic mode. Used most commonly in situation where off centering of the subject in composition and wish to retain the exposure setting of the subject OR where the level of exposure reading both the subject of interest and the background exposure reading is different eg. Recommended when the photographer wants to control an exposure based on a scene's particular brightness area with Center Weighted or Spot Metering. Agitation Keeping the developer, stop bath, or fixer in a gentle, uniform motion while processing film or paper.
Agitation helps to speed and achieve even development and prevent spotting or staining.
The available natural light completely surrounding a subject. Light already existing in an indoor or outdoor setting that is not caused by any illumination supplied by the photographer i.e. not by artificial light source. The area of a scene that a lens covers or sees. Angle of view is determined by the focal length of the lens. F11 Reflex Nikkor, only slightly over 1 degree of view.