|Spot meters: Soligor II, Pentax Spotmeter V (analog),|
Pentax digital, and Minolta Spot Meter F
image by rst12 (Image rights)
A spot meter is an exposure meter that measures reflected light from a narrow portion of a scene. Compared to more common reflective meters that cover about 25 to 30 degrees, spot meters typically only include an angle of 1 to 5 degrees. Where averaging meters can be fooled by large unusually bright or dark areas, a spot meter permits readings to be taken exclusively from the crucial areas of the subject. However a spot meter may present problems if the chosen area does not represent a scene correctly.
Users of the Zone System frequently employ a spot meter to evaluate the luminance range from the brightest to darkest areas of a subject.