Konica Minolta F300 What is an Ev? What is a stop, Exposure latitude, 0.0 Ev, –1.0Ev, –1stop, –2.0Ev, +2.0 Ev, +1.0 Ev, +1 stop, –2stops, subject, subject, +2 stops, Change in Ev

What is an Ev? What is a stop?

Ev stands for exposure value. The term stop comes from the name of aperture plates used in early lenses. A change of one Ev or one stop will adjust the exposure calculated by the camera by a factor of two.

Change in Ev	Change in stops	Adjustment to exposure
+2.0 Ev	+2 stops	4X as much light
+1.0 Ev	+1 stop	2X as much light
0.0 Ev	Calculated exposure
–1.0 Ev	–1 stop	1/2 as much light
–2.0 Ev	–2 stops	1/4 as much light

Exposure latitude

		contrast-Low	contrast-High
		subject	subject
	Increasing exposure
Decreasing exposure

How much the exposure can be adjusted using exposure compensation or manual exposure before there is a loss of image quality depends on subject contrast. High-contrast subjects have a great range of tones, deep shadows and brilliant highlights, whereas low-contrast subjects have a limited tonal range,such as a landscape on an overcast day.

High-contrast subjects have a much narrower exposure latitude before the shadows block up from underexposure or the highlights washout from overexposure. To ensure the best possible exposure for a subject, brackets (p. 46) can be made. Some scenes are beyond the contrast range of the CCD. In those situations, expose for the main subject of the image.

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