Difference between revisions of "Guide number"

From Camera-wiki.org
Jump to: navigation, search
Line 4: Line 4:
 
<span style="font-family:Courier">
 
<span style="font-family:Courier">
 
aperture=<U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;guide number&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U><br/>
 
aperture=<U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;guide number&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U><br/>
−
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;distance between flash and image subject
+
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;distance between flash and image subject</span> (in meters)
−
</span>
 

Revision as of 17:39, 28 May 2006

The guide number is a value indicating the strength of a flashlight. According to Andreas Feininger the guide number helps finding the right aperture for flashlight exposures with the formula


aperture=                guide number             
         distance between flash and image subject (in meters)

Retrieved from "http://camera-wiki.org/index.php?title=Guide_number&oldid=23804"