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Comparing ray/doc/man/man1/pdfblur.1 (file contents):
Revision 1.4 by greg, Tue Jan 18 03:59:40 2005 UTC vs.
Revision 1.5 by greg, Tue Jan 18 20:19:56 2005 UTC

#	Line 102 | Line 102 | option to the overall
102		divided by
103		.I nsamp
104		to minimize ghosting in the output.
105	+	.PP
106	+	To simulate a particular camera's aperture, divide the focal length of
107	+	the lens by the f-number, then convert to the corresponding
108	+	world coordinate units.
109	+	For example, if you wish to simulate a 50mm lens at f/2.0 in
110	+	a scene modeled in meters, then you divide 50mm by 2.0 to get 25mm,
111	+	which corresponds to an effective aperture of 0.025 meters.
112		.SH EXAMPLES
113		To use
114		.I pinterp

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