When using WITHOUT condenser lens just above light bulb we place lamp JUST on the focal length of first fresnell: usually 220mm: WHAT WHEN using condenser lens above light bulb: HOW we conut than the distance between fresnell and light source?
thanks
QUOTE (velikigrizli @ Jul 29 2006, 07:42 AM) 
When using WITHOUT condenser lens just above light bulb we place lamp JUST on the focal length of first fresnell: usually 220mm: WHAT WHEN using condenser lens above light bulb: HOW we conut than the distance between fresnell and light source?
thanks
thanks
use dazzzlas precondenser calculator:
http://www.lumenlab.com/forums/index.php?showtopic=11256#
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